Search: 178 results found for "green calcite"

Green Calcite Rough 20-30mm (3units)

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£6.00

Green Fluorite & Calcite Cluster | Heights Mine, Weardale | County Durham, UK

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£36.00

Serpentine Hearts | 28-30mm | China Hearts Tali & Loz Crystals

Serpentine Hearts | 28-30mm | India

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£5.00

New Beginnings Crystal Gift Set

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£12.00

New Beginnings Crystal Gift Set

Whether you are starting a new business, moving house, planning on working out more or any other New Beginnings. These are the crystals to help support you or your loved with your adventures!

Crystals: Carnelian, Epidote, Moonstone, Green Calcite, Yellow Calcite, Labradorite

Carnelian

Carnelian Inspires new paths and will give you the motivation and courage to step into action. Meditating and setting intentions with Carnelian transmits positive energies throughout your body and aura which will bring you back to your core self, ready to start the new beginning.

Epidote

Epidote is like a trusted friend that is always there to lend an ear and shoulder when things seem to go sideways. It will help replenish your energy during busy times and leave you feeling recharged and refreshed.

Moonstone

Moonstone is often associated with feminine energy, new beginnings and healing, all of which are great tools to help you navigate unexplored paths. Don’t forget to take full advantage of the new moon energy to charge and elevate the power of your crystal.

Green Calcite

Green Calcite can help you deepen your connection to the earth element and feel more grounded and secure. An ideal choice when you want to prioritise personal growth and development.

Yellow Calcite

One of the best crystals for stress and anxiety, Yellow Calcite aids in learning and wisdom and promotes enthusiasm. Working with Yellow Calcite will allow you to reach within and activate your inner power so you can forge new paths.

Labradorite

‘'The Stone of Transformation & Change” Labradorite can release illusions and flawed perceptions that are holding you back. Labradorite is a great crystal to have around your house, it grounds your spiritual energies which boosts new and exciting energies in turn. This will help to develop your new goals and boost you to take the next steps to execute them.

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Cobaltoan Calcite with Malachite | DRC

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£51.00

Uvarovite Garnet Specimen 9.1gr Specimens Tali & Loz Crystals

Uvarovite Garnet Specimen | 9.1g | With Calcite | Ural Mountains, Russia

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~~£38.00~~ £22.50

Dogtooth Calcite Specimen 178gr

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~~£48.00~~ £24.00

Dogtooth Calcite Specimen, 24cm

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£230.00

Optical Rose Pink Calcite Block 5.5cm

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~~£42.00~~ £21.00

Green Fluorite Tumblestones 20-30mm

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£4.50

Cobalto Calcite Rough 556g

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~~£85.00~~ £42.50

Cobalto Calcite Rough 561g

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~~£85.00~~ £42.50

Green Aventurine Tumblestones 20-30mm

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£4.00

Green Fuchsite Palmstones | 6cm | India

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£12.00

Green Quartz Tumblestones 20-30mm

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£4.00

Malachite Stalactite 29gr, Zaire- Congo Minerals Tali & Loz Crystals

Malachite Stalactite | 29g | Zaire-Congo

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£38.00

Silver on Calcite Specimen 27.90gr, Sold as Seen

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£140.00

Green Fluorite Statement Sphere 8.2KG

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£795.00

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Yellow Calcite: The Sunshine in a Family That Produces Every Colour in the Spectrum

What is Yellow Calcite? Mineral Group: Carbonate | Category: Calcite | Formula: CaCO₃ | Hardness: 3 (Mohs) Yellow Calcite is a colour variety of Calcite, the calcium carbonate mineral that is one of the most abundant on Earth, distinguished by warm yellow to golden tones produced by iron impurities within the crystal structure. It belongs to the same mineral species as Blue Calcite, Cobaltoan Calcite, Zebra Calcite, and the many other Calcite colour varieties: all are fundamentally the same calcium carbonate mineral, with colour differences arising entirely from trace elements and impurities rather than from any change in the essential chemistry. Calcite forms the primary component of limestone, marble, and chalk, and it is produced in vast quantities by marine organisms that use dissolved calcium carbonate from seawater to build their shells and skeletons. When these organisms die and their remains accumulate on the sea floor over millions of years, they build the sedimentary sequences that eventually become limestone, and it is within these sequences and the hydrothermal veins that cut through them that most collector-quality Calcite varieties, including Yellow Calcite, are found. The name Calcite derives from the Latin calx, meaning lime, a reference to the quicklime produced when limestone is heated, one of the oldest and most significant chemical processes in human technological history. Yellow Calcite inherits this name and this history while adding the specific character of its iron-driven colour. Formation and Geological Context Yellow Calcite forms in sedimentary and hydrothermal environments through the same fundamental process as all Calcite varieties: the precipitation of calcium carbonate from mineral-rich water. The process is straightforward to understand. Water dissolves calcium and carbonate ions from surrounding rocks as it percolates through the ground. When conditions change, whether through evaporation, temperature shifts, or changes in pressure and carbon dioxide content, these dissolved ions come out of solution and crystallise as Calcite. This happens in cave systems where dripping water builds stalactites, in sedimentary basins where layer after layer of carbonate accumulates, and in hydrothermal veins where hot mineral-rich fluids cool and deposit their mineral load. The yellow colour enters the picture through iron. The rocks through which the calcium-carbonate-bearing water moves often contain iron-bearing minerals. Small amounts of iron, specifically in the Fe³⁺ oxidation state, are dissolved into the water alongside the calcium and carbonate and become incorporated into the Calcite structure as it crystallises. This iron, even in very small concentrations, absorbs blue wavelengths of visible light and reflects yellow and orange, producing the warm golden tones that define Yellow Calcite. The depth of yellow in any given specimen depends on how much iron was incorporated during crystallisation. Pale, almost cream-coloured material contains very little iron. Deep golden yellow material contains more. This variation between specimens from the same locality, and between different localities worldwide, reflects the natural variation in iron availability in different geological environments. Major sources of Yellow Calcite include Mexico, which produces some of the finest commercial material, as well as the United States, Peru, Brazil, and various localities across Europe and Asia. Mexico in particular has a rich tradition of producing high-quality Calcite specimens of many colour varieties, and yellow material from Mexican sedimentary and hydrothermal deposits is among the most widely available in the collector market. Key Physical Properties Property Detail Mineral Group Carbonate Category Calcite Crystal System Trigonal Hardness 3 Mohs Specific Gravity 2.71 Refractive Index 1.486 – 1.658 Birefringence 0.172 Pleochroism None Lustre Vitreous to resinous Fracture Conchoidal to uneven Cleavage Perfect in three directions Tenacity Brittle Colour Pale yellow to deep golden yellow Streak White Formula CaCO₃ Fluorescence Sometimes present under UV Safe to Cleanse in Water Quick rinse only The birefringence value of 0.172 deserves a mention because it is one of the highest of any common mineral and produces a visible optical effect worth experiencing firsthand. Place a clear piece of Calcite over a printed word and you will see the word doubled: the crystal splits light into two rays travelling at slightly different speeds, producing two separate images. This effect, called double refraction, is not visible in most Yellow Calcite because the yellow colour and typical opacity of the material prevent clear light transmission, but it is a property of every Calcite crystal regardless of colour. The perfect cleavage in three directions means Calcite will split cleanly along flat planes if knocked at the right angle, producing rhombohedron-shaped fragments. This is a defining diagnostic property of Calcite and one of the most immediately recognisable features of any broken specimen. The Yellow Colour: Iron in the Calcite Structure Most coloured minerals get their colour from a trace element that substitutes into the crystal structure and absorbs specific wavelengths of light. In Yellow Calcite, iron in the Fe³⁺ oxidation state is the primary colouring agent. Iron is one of the most common elements in the Earth's crust, and it turns up as a trace impurity in a vast number of minerals. In Calcite's calcium carbonate structure, small amounts of iron can substitute for calcium within the crystal lattice during formation. When Fe³⁺ iron occupies these sites, it absorbs light in the blue and violet parts of the visible spectrum. The wavelengths left over after this absorption are the yellows and oranges that reach the eye. This is the same fundamental mechanism that colours many other yellow and orange minerals: Citrine gets its yellow from a different iron configuration in Quartz, Hessonite Garnet gets its warm orange from iron-bearing inclusions, and Topaz can show yellow tones from iron impurities. In each case iron is the common thread, but the specific structural environment in which the iron sits determines the exact shade of colour produced. It is also worth noting that Yellow Calcite can sometimes be confused with Yellow Fluorite or with light honey-coloured Amber in polished form. The streak test is the quickest distinction: Calcite always leaves a white streak, while Amber leaves a pale yellowish streak and is not a mineral at all. The specific gravity of 2.71 for Calcite is also reliable: Amber is dramatically lighter at around 1.05, and Fluorite at 3.18 is heavier. Fluorescence in Yellow Calcite Yellow Calcite sometimes displays fluorescence under ultraviolet light, emitting a visible glow when a UV lamp is shone on it. This property varies between specimens and is not present in all Yellow Calcite, but where it occurs it adds an additional layer of scientific interest. Fluorescence in Calcite is typically produced by manganese impurities in the Mn²⁺ oxidation state, which absorb UV energy and re-emit it as orange to yellow visible light. The colour of the fluorescence can therefore differ from the body colour of the specimen: a Yellow Calcite piece might show orange fluorescence under UV because the manganese activator produces a different emission colour from the iron that produces the yellow body colour. Testing Yellow Calcite under both shortwave and longwave UV is a simple and rewarding exercise: different specimens from different localities respond differently, and the variation in fluorescent response reflects the variation in trace element chemistry between geological sources. Some pieces will glow brightly, others not at all, and the difference tells you something about the specific impurity suite of each specimen. Yellow Calcite Within the Calcite Family Calcite is one of the most colour-diverse mineral species known, and Yellow Calcite is just one of many visually distinct varieties produced by different trace element combinations within the same fundamental calcium carbonate structure. Blue Calcite gets its pale blue tones from fine silicate inclusions or trace impurities that scatter blue light. Cobaltoan Calcite is vivid pink from cobalt substituting for calcium. Mangano Calcite is pink from manganese. Orange Calcite, closely related to Yellow Calcite, contains higher iron concentrations that push the colour from yellow into orange and red-orange territory. Zebra Calcite displays alternating black and white bands from organic carbon impurities. Caribbean Calcite combines pale blue Calcite with brown Aragonite. Green Calcite gets its colour from chlorite inclusions. Yellow Calcite occupies the warm, sunny end of this family, its iron-driven colour placing it alongside the oranges and golds rather than the cooler blues and pinks. Within the family it is one of the more widely available and accessible varieties, appearing in many geological settings worldwide wherever iron-bearing water has deposited calcium carbonate. Care and Handling Yellow Calcite requires careful handling for the same reasons as all Calcite varieties: low hardness, perfect cleavage in three directions, and moderate sensitivity to water and acids. At hardness 3, Yellow Calcite scratches easily and should be stored separately from all harder minerals with soft padding. A copper coin at hardness 3.5 will scratch it, and most other minerals in a collection will do so even more readily. Avoid placing on abrasive surfaces and handle with clean, dry hands. Water contact should be limited to a quick, gentle rinse if needed, followed by immediate and thorough drying. Calcite is slightly soluble in water and prolonged contact, particularly with acidic water, will dull and etch polished surfaces over time. The best everyday cleaning method is a soft dry cloth. The perfect cleavage in three directions means that a sharp impact at the right angle can split even a solid-looking piece cleanly. Handle with care and avoid knocking against hard surfaces. Traditional Associations While this guide focuses on the science of Yellow Calcite, it is valued in spiritual and mindful practices for its associations with confidence, inner strength, mental clarity, and solar energy. Its warm yellow colour has linked it naturally to the Solar Plexus Chakra across crystal traditions, and it is commonly used in practices focused on motivation, personal empowerment, and clarity of thought. These associations are rooted in cultural and traditional use rather than scientific properties. For a full exploration of how to work with Yellow Calcite spiritually, see our dedicated spiritual guide. Summary Yellow Calcite is an iron-coloured variety of one of the Earth's most abundant and geologically significant minerals. Its warm yellow to golden tones arise from Fe³⁺ iron substituting into the calcium carbonate crystal structure during formation, a colour mechanism shared with many other yellow and orange minerals but producing in Calcite a distinctively warm, sometimes translucent quality that reflects the specific optical properties of the trigonal carbonate structure. Within the extraordinarily diverse Calcite family it occupies the warm, energetic end of the colour spectrum, available in many geological settings worldwide and accessible at every level of collecting. Handle it with respect for its softness and cleavage, keep it dry, and it will reward you with a quietly radiant presence in any collection. Browse our full Yellow Calcite collection to find raw specimens, towers, spheres, and polished pieces. As always, our inbox and DMs are open if you would like guidance or simply wish to explore further. Contact us Love, Laura Further Reading Cobaltoan Calcite: The Vivid Pink of the Calcite Family Mangano Calcite: Gentle Pink Energy and Heart Healing Caribbean Calcite: Ocean Blues and Earthy Browns Aragonite: Earth Star and Grounding Energy Pyrite: Harness the Power of Confidence and Manifestation

on Jan 30 2025

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Blue Calcite: Why This Gentle Blue Crystal Belongs in Both a Collection and a Physics Textbook

What is Blue Calcite? Mineral Group: Carbonate | Category: Carbonate Mineral | Formula: CaCO₃ | Hardness: 3 (Mohs) Blue Calcite is a colour variety of Calcite, the most stable and widespread polymorph of calcium carbonate, distinguished by a pale to medium blue coloration that ranges from near-white sky blue through to deeper cornflower tones depending on the concentration and distribution of the trace elements responsible for the colour. It belongs to the same mineral species as colourless Calcite, Iceland Spar, optical Calcite, and the countless other colour varieties of this exceptionally common and geologically significant mineral. What sets Blue Calcite apart is both its visual character and the specific geological conditions required to produce the blue coloration. Calcite as a mineral species is one of the most abundant on Earth, forming the primary constituent of limestone, marble, chalk, and a vast range of other sedimentary and metamorphic rocks. It participates directly in the global carbon cycle, is the principal building material of marine organisms from corals to foraminifera, and has been used by human cultures for construction, sculpture, and industry for thousands of years. Blue Calcite represents a visually distinctive subset of this widespread and scientifically important mineral, its colour making it immediately recognisable among the many Calcite varieties available to collectors. Formation and Geological Context Calcite forms in an extraordinary range of geological environments, from the deep-sea sediments where microscopic organisms rain their carbonate shells onto the ocean floor, to the hydrothermal veins where calcium-rich fluids deposit crystalline Calcite in fractures and cavities, to the cave systems where slowly dripping groundwater builds stalactites and stalagmites over thousands of years. Blue Calcite forms principally in sedimentary environments, where calcium carbonate-rich solutions crystallise under low-temperature conditions. The blue coloration is not present in pure calcium carbonate, which is colourless to white. It arises from trace impurities introduced into the crystal structure during formation, most commonly small amounts of clay minerals, fine silicate inclusions, or other compounds that selectively absorb certain wavelengths of light and reflect blue tones. The precise chemistry varies between localities, and the trace element or inclusion responsible for the blue in any given specimen depends on the specific mineralogy of its formation environment. The sedimentary settings that produce Blue Calcite typically involve slow crystallisation from calcium carbonate-saturated groundwater or brine percolating through fine-grained sedimentary sequences. This slow growth allows trace impurities to be incorporated evenly and consistently throughout the crystal, producing the even, diffuse blue that characterises the finest specimens. Rapid crystallisation tends to produce patchier colour distribution and more varied internal textures. Major sources of Blue Calcite include Mexico, which produces significant volumes of pale blue massive material widely used in carving and polished pieces, as well as South Africa, Romania, and parts of the United States. Material varies considerably between localities in depth of colour, translucency, and internal texture. Key Physical Properties Property Detail Mineral Group Carbonate Category Carbonate Mineral Crystal System Trigonal Hardness 3 Mohs Specific Gravity 2.71 Refractive Index 1.486 – 1.658 Birefringence 0.154 – 0.172 Pleochroism Weak Lustre Vitreous to resinous Fracture Conchoidal Cleavage Perfect in three directions Tenacity Brittle Colour Pale blue, sky blue Formula CaCO₃ Fluorescence Variable: red, blue, yellow under UV Phosphorescence Sometimes present Safe to Cleanse in Water Quick rinse only The birefringence value of 0.154 to 0.172 is among the highest of any common mineral and is one of Calcite's most physically striking properties. When a clear piece of Calcite is placed over text or an image, the strong double refraction causes a visible doubling of what is seen through the crystal, a phenomenon that has made Calcite historically important in the development of optical science. Blue Calcite, being typically more included and less transparent than optical-grade material, rarely displays this effect dramatically, but it arises from the same fundamental crystal structure. The Remarkable Optical Properties of Calcite The exceptionally high birefringence of Calcite deserves closer attention because it places the mineral in a rare category of substances that have played a direct role in the history of physics and optical science. Birefringence, or double refraction, occurs when light entering a crystal is split into two rays that travel at different speeds in different directions through the material. In most transparent minerals this effect is weak enough to be undetectable without instruments. In Calcite it is so pronounced that it is visible to the naked eye: a single crystal placed over printed text produces two clearly separated images rather than one. This property was studied extensively by the Danish scientist Rasmus Bartholin in 1669 using large transparent Calcite crystals from Iceland, known as Iceland Spar, and his observations laid foundational groundwork for the understanding of light polarisation. The subsequent work of Christiaan Huygens and later Augustin-Jean Fresnel built on Calcite's optical behaviour to develop the wave theory of light. Calcite crystals were used in the construction of the first polarising optical instruments and remain important in optical research today, particularly in applications requiring precisely controlled polarisation of light. Blue Calcite participates in the same optical physics, though the inclusions responsible for its colour also reduce the transparency that makes the double refraction most visible. Specimens with paler, more translucent blue coloration occasionally display a visible doubling effect that connects them directly to this scientific heritage. Fluorescence and Phosphorescence One of the more unusual properties of Calcite across its many varieties is the tendency to fluoresce under ultraviolet light, and Blue Calcite is among the more variable and interesting Calcite varieties in this respect. Fluorescence in minerals is the emission of visible light when the mineral is illuminated by ultraviolet radiation. It occurs when trace activator ions within the crystal absorb UV energy and re-emit it as longer-wavelength visible light. In Calcite, manganese in the Mn²⁺ oxidation state is the most common fluorescence activator, typically producing orange to red emission. Other activators including rare earth elements can produce blue, yellow, green, or white fluorescence depending on their identity and concentration. Blue Calcite can display fluorescence in red, blue, yellow, or other colours under both shortwave and longwave UV depending on the specific trace element chemistry of each specimen. Some specimens also show phosphorescence, continuing to emit visible light briefly after the UV source is removed. This variability makes UV testing an interesting and informative exercise with Blue Calcite, as different specimens from different localities can respond quite differently to the same light source. Blue Calcite Within the Calcite Family Calcite is one of the most colour-variable mineral species known, and understanding Blue Calcite in relation to its many varieties helps contextualise its properties and distinguishes it from superficially similar materials. Colourless and white Calcite is the pure form, free of significant impurities. Iceland Spar is the name given to optically clear, transparent Calcite used in optical instruments. Manganese-bearing Calcite produces pink to rose tones. Iron-bearing varieties tend toward yellow, orange, and brown tones. Green Calcite derives its colour from chlorite inclusions or trace copper. Cobaltoan Calcite produces vivid pink to magenta tones from cobalt substitution and is among the most striking of all Calcite colour varieties. Caribbean Calcite combines pale blue Calcite with brown Aragonite in a naturally occurring polymorph combination. Blue Calcite sits within this family as one of the softer, more diffuse colour varieties, its pale blue tones produced by inclusions or trace elements rather than by a strong single-element substitution, which is why the colour tends toward delicate rather than saturated tones. Care and Handling Blue Calcite requires careful handling due to its softness, perfect cleavage, and moderate water sensitivity. At hardness 3 it is among the softer minerals regularly encountered in collections and will scratch with minimal pressure from harder materials. Store separately from harder minerals with soft padding between pieces. Water contact should be limited to a quick rinse if necessary and followed immediately by thorough drying. Calcite is slightly soluble in water, particularly in mildly acidic conditions, and prolonged exposure will etch and dull any polished surface. Avoid soaking entirely, and keep away from humid storage environments. Clean with a soft dry cloth as a first preference. The perfect cleavage in three directions means Blue Calcite will split cleanly along flat planes if subjected to sharp impact. Handle with care and support the full base of specimens rather than gripping at edges. Avoid ultrasonic cleaning equipment, which can propagate stress along cleavage planes. Traditional Associations While this guide focuses on the science of Blue Calcite, it is widely valued in spiritual and mindful practices for its associations with calm, clear communication, and inner peace. In chakra work it is connected to the Throat Chakra and Third Eye Chakra, and it is commonly used in meditation, dream work, and practices focused on self-expression and mental clarity. These associations are rooted in cultural and traditional use rather than scientific properties. For a full exploration of how to work with Blue Calcite spiritually, see our dedicated spiritual guide. Summary Blue Calcite is a trace-element-coloured variety of one of the Earth's most abundant and scientifically significant minerals, its pale blue tones a quiet reminder that even the most common mineral species can produce visually distinctive and geologically interesting varieties under the right conditions. From its role in the history of optical science through its birefringence, to its variable fluorescence under ultraviolet light, to its place within the extraordinarily diverse Calcite family, Blue Calcite rewards attention beyond its immediate visual appeal. Handle it with care, keep it dry, and it will remain a quietly striking presence in any collection. Shop all Blue Calcite As always, our inbox and DMs are open if you would like guidance or simply wish to explore further. Contact us Love, Laura Further Reading Caribbean Calcite: The Crystal Named After a Sea But It Has Never Been Near Calcite Family Mineral Guides Cobalto Calcite Mineral Guide Chrysocolla: Express Your Truth with Serenity Apophyllite: Crystalline Catalyst for Transformation and Spiritual Enrichment Use These Five Blue Crystals on Your Upper Chakras Third Eye Chakra: Crystals and Guidance The Seven Chakras Guide

on Feb 19 2025

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