Search: 138 results found for "clear quartz cluster"

Tourmaline in Clear Quartz Cluster 371gr

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Dhs. 606.00

Clear Quartz Cluster With Elestial Etchings Clusters Tali & Loz Crystals

Clear Quartz Cluster With Elestial Etchings 10.5cm

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Dhs. 228.00

Hand Carved Clear Quartz | 20.5g | India

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Dhs. 278.00

Hand Carved Clear Quartz | 13.6g | India

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Dhs. 278.00

Clear Quartz Tumblestones AAA-Grade 20-30 mm

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Dhs. 26.00

Clear Quartz Freeform 0.6kg | AAA-Grade Brazil

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Dhs. 707.00

Clear Quartz Rough Points 25-40mm

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Dhs. 31.00

High Quality Clear Quartz Self Standing Heart Carving Carving Tali & Loz Crystals

High Quality Clear Quartz Self Standing Heart Carving 11.5cm

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Dhs. 278.00

OUTLET Clear Quartz with Natural Phantoms Tower 5.7cm

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~~Dhs. 127.00~~Dhs. 91.00

Clear Quartz Worry Stones Worry Stones Tali & Loz Crystals

Outlet Clear Quartz Worry Stones 4cm | Intuitively Chosen

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~~Dhs. 26.00~~Dhs. 16.00

Clear Quartz Sphere 52mm

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Dhs. 142.00

1.3kg Faceted Clear Quartz With Rainbows

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Dhs. 1,666.00

Clear Quartz Sphere 0.7KG Spheres Tali & Loz Crystals

Clear Quartz Sphere 0.7KG, Brazil

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Dhs. 430.00

Crystal Set For Serenity

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Dhs. 51.00

Clear Quartz Freeform with Chlorite Inclusions 6.3cm

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Dhs. 122.00

Indonesian Clear Quartz Point With Tourmaline Inclusions 9cm Points Tali & Loz Crystals

Clear Quartz Point With Tourmaline Inclusions 9cm, Indonesia

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Dhs. 379.00

Indonesian Clear Quartz Point With Tourmaline Inclusions 13.7cm Points Tali & Loz Crystals

Clear Quartz Point With Tourmaline Inclusions 13.7cm, Indonesia

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Dhs. 758.00

Clear Quartz Palmstones 4cm

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Dhs. 48.00

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Clear Quartz: The Mineral Inside Your Watch, Your Phone, and Your Collection

What is Clear Quartz? Mineral Group: Silicate | Category: Tectosilicate | Formula: SiO₂ | Hardness: 7 (Mohs) Clear Quartz is the purest and most abundant variety of Quartz, a silicon dioxide mineral that ranks among the most common and geologically widespread minerals on Earth. It forms in an extraordinary range of geological environments, from the cores of mountain ranges to shallow hydrothermal veins near the surface, and it is found on every continent without exception. Its chemical simplicity, just silicon and oxygen in a ratio of one to two, belies the complexity and variety of the crystals it produces. What distinguishes Clear Quartz from the coloured Quartz varieties is the absence of impurities. Amethyst, Smokey Quartz, Citrine, and Rose Quartz all owe their colours to trace elements or structural defects within the silicon dioxide lattice. Clear Quartz contains neither in significant quantities. The result is a crystal that is either fully transparent and colourless, or white and milky where microscopic fluid inclusions or fine fractures scatter light internally. In either case the underlying mineral is chemically the same: pure SiO₂. Quartz belongs to the tectosilicate subgroup, meaning its silicon and oxygen atoms form a continuous three-dimensional framework in which every oxygen atom is shared between two silicon atoms. This fully connected framework structure is responsible for the high hardness, chemical stability, and resistance to weathering that make Quartz so persistent and so prevalent in the geological record. Quartz is the dominant mineral in many sandstones and most beach sands precisely because it survives the physical and chemical processes of erosion that destroy less stable minerals. Formation and Geological Context Clear Quartz forms in a wider variety of geological settings than almost any other mineral. In igneous environments it crystallises directly from silica-rich magmas, typically as one of the last minerals to form as the magma cools and the remaining melt becomes progressively enriched in silica. In granites and related rocks, Quartz fills the spaces between earlier-formed minerals, producing the interlocking crystalline texture characteristic of coarse-grained igneous rocks. In hydrothermal settings, which produce many of the finest collector specimens, silica-rich fluids circulate through fractures and cavities in the crust. As these fluids cool and their silica carrying capacity decreases, Quartz crystallises slowly onto the walls of the cavity, building up the well-formed, euhedral crystals with distinct faces and terminations that are most recognisable as Quartz points and clusters. The clarity and size of hydrothermal Quartz crystals depends on the temperature and chemistry of the fluid, the space available for growth, and the duration of the crystallisation process. In metamorphic rocks, Quartz recrystallises under heat and pressure to form the interlocking granular texture of quartzite, one of the hardest and most resistant of all common rocks. Quartz veins cutting through metamorphic and igneous terranes are among the most common geological structures visible in outcrops worldwide. Major sources of high quality Clear Quartz crystals include Brazil, which dominates global supply and produces enormous quantities of well-formed points and clusters, as well as Madagascar, the United States, China, Russia, and the Alps. Arkansas in the United States is particularly noted for the exceptional clarity and consistent doubly terminated form of its Quartz crystals. Key Physical Properties Property Detail Mineral Group Silicate Category Tectosilicate Crystal System Trigonal Hardness 7 Mohs Specific Gravity 2.65 Refractive Index 1.544 – 1.553 Birefringence 0.009 Pleochroism None Lustre Vitreous Fracture Conchoidal Cleavage Indistinct Tenacity Brittle Colour Colourless, white, milky Formula SiO₂ Safe to Cleanse in Water Yes The specific gravity of 2.65 is one of the most consistent and diagnostically reliable values in mineralogy, shared across all macrocrystalline Quartz varieties regardless of colour. The refractive index range of 1.544 to 1.553 and birefringence of 0.009 are equally consistent and serve as reliable gemological identification markers. The absence of pleochroism confirms that the mineral has no directional colour variation, as expected in a colourless material. It is worth noting that while Quartz is often described as belonging to the hexagonal crystal system in older references, modern crystallography classifies it more precisely within the trigonal division of that system, reflecting the three-fold rather than six-fold rotational symmetry of its crystal structure. Clarity, Inclusions, and the Spectrum of Appearance Pure, inclusion-free Clear Quartz is water-clear and visually indistinguishable from high quality glass to the unaided eye. In practice, most natural specimens contain some degree of internal features that affect their appearance and are part of what makes each crystal individual. Milky Quartz aka White Quartz is the most common variety of Quartz overall, and its white, opaque to translucent appearance results from enormous numbers of microscopic fluid and gas inclusions trapped within the crystal structure during growth. These inclusions scatter light rather than allowing it to pass straight through, producing the white colour. Milky and clear zones often coexist within a single crystal, recording fluctuating growth conditions. Phantoms are among the most visually striking inclusion features in Clear Quartz. They appear as ghost-like outlines of earlier crystal terminations preserved within the body of the crystal, formed when a fine coating of another mineral (often Chlorite, Hematite, or another Quartz generation) settled on the crystal surface during a pause in growth before a new phase of clear Quartz grew over it. Each phantom records a distinct episode in the crystal's growth history. Browse our Chlorite Quartz guide to learn more about this fascinating inclusion mineral. Rutilated Quartz contains needle-like crystals of Rutile, a titanium oxide mineral, growing within the Quartz. These inclusions range from fine golden threads to bold copper-coloured or silver needles and are considered highly desirable by collectors. Tourmalinated Quartz contains black Tourmaline needles in a similar arrangement; read more in our Tourmaline guide. Garden or Scenic Quartz, also known as Lodalite, contains chlorite, clay minerals, or other inclusions arranged in patterns that can resemble landscapes, foliage, or abstract forms within the crystal. Shop Phantom Clear Quartz Quartz in Technology and Industry Clear Quartz has a significance in the modern world that extends far beyond mineralogy and collecting. Its piezoelectric properties (the ability to generate an electrical charge when mechanically stressed and, conversely, to change shape when an electric current is applied) make it one of the most technologically important minerals known. This piezoelectric behaviour arises directly from the asymmetry of the Quartz crystal structure. When pressure is applied, the displacement of silicon and oxygen atoms within the lattice creates a separation of electrical charge across the crystal, generating a measurable voltage. This effect is precisely reversible and highly consistent, which makes Quartz an ideal frequency reference in electronic devices. For much of the twentieth century, precisely cut Quartz crystals regulated the frequency of oscillators in clocks, radios, televisions, and computers. The quartz watch, which replaced mechanical timekeeping for most of the world's population, relies on a tiny blade of Quartz vibrating at 32,768 times per second to keep time with an accuracy that no purely mechanical system could match. Today synthetic Quartz grown under controlled hydrothermal conditions in industrial autoclaves meets most of this demand, but the underlying mineral is unchanged from what forms naturally in the Earth's crust. Quartz is also a primary raw material in the production of silicon for semiconductors, in optical instruments where its transparency to ultraviolet light gives it advantages over glass, and in the construction and ceramics industries. Clear Quartz Within the Quartz Family Clear Quartz is the reference point against which all other Quartz varieties are understood. Every coloured variety (Amethyst, Citrine, Smokey Quartz, Rose Quartz, and the rest) is simply Clear Quartz in which something additional has happened: a trace element has substituted into the lattice, radiation has created colour centres, or microscopic inclusions have scattered light in particular ways. This relationship has practical implications. Most coloured Quartz varieties can be converted back toward colourless by sufficient heat. Amethyst heated above around 470 degrees Celsius converts to the yellow-orange tones of Citrine as the iron-based colour centres are restructured. Smokey Quartz bleaches to colourless above around 300 degrees Celsius. Understanding Clear Quartz as the baseline state of the mineral helps make sense of the entire family. You can explore the full science of colour in our Smokey Quartz, Amethyst, and Golden Healer Quartz guides. Care and Handling Clear Quartz is among the most straightforward minerals to care for. Its hardness of 7 provides good resistance to everyday scratching, though it will mark softer stones and surfaces and be marked by harder ones. It is safe to cleanse in water and is chemically stable under normal conditions. The main consideration for Clear Quartz is light exposure. Colourless material is unaffected by light, but any specimen with colour (whether a hint of smoky grey, pale amethyst, or yellow) may fade gradually under prolonged strong UV exposure. Store high clarity specimens with care to protect natural faces and terminations, which can chip if knocked. Clean with a soft cloth or mild soapy water, rinse well, and dry thoroughly. Traditional Associations While this guide focuses on the science of Clear Quartz, it holds a prominent place in spiritual and mindful practices across cultures and throughout history, associated with clarity, amplification, and connection to higher consciousness. Its use in divination, healing, and ritual is documented across many traditions worldwide. These associations are rooted in cultural and traditional use rather than scientific properties. For a full exploration of how to work with Clear Quartz spiritually, see our dedicated spiritual guide. Summary Clear Quartz is the purest expression of one of the Earth's most abundant and geologically significant minerals. Its silicon dioxide framework structure, consistent physical properties, and extraordinary range of formation environments make it a foundational specimen in any mineralogical collection. From the oscillator in a wristwatch to the hydrothermal cavities of the Brazilian highlands, Quartz is present at almost every level of both the natural and technological world. For those beginning their journey with minerals, it is an ideal starting point. For experienced collectors, its variety of forms, inclusions, and localities ensures it never becomes ordinary. Shop all Clear Quartz 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 Smokey Quartz: One of Earth's Most Abundant Minerals and Its Most Misunderstood Amethyst: The Royal Purple Gem of Tranquility and Healing Golden Healer Quartz: The Science Behind the Glow Hematoid Quartz: Clear Quartz That Ran Into Iron and Never Looked Back Chlorite Quartz: Embrace Purity and Grounding Lodalite: Finding your Cosmic Symphony Herkimer Diamond: Not a Diamond, but Arguably More Interesting How to Choose the Right Crystals Based on Their Shapes Top 15 Crystals and Stones for Healers

on Feb 07 2025

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Hollandite: How a Rare Manganese Mineral Creates Natural Star Patterns in Quartz

What is Hollandite? Mineral Group: Oxide | Category: Manganese Oxide | Formula: Ba(Mn⁴⁺,Mn²⁺)₈O₁₆ | Hardness: 4.5 – 6 (Mohs) Hollandite is a barium manganese oxide mineral belonging to the oxide mineral group, best known to collectors not as a standalone specimen but as the source of the striking dark fibrous or star-shaped inclusions found within certain Quartz crystals. In this form, sometimes marketed as Hollandite in Quartz or Star Hollandite Quartz, the contrast between the deep steel grey to black inclusions and the transparent host crystal produces specimens of considerable visual impact and genuine geological interest. The mineral was named after Thomas Henry Holland, a British geologist who served as Director General of the Geological Survey of India in the early twentieth century, and whose work contributed significantly to the understanding of Indian geology. The name honours his scientific contributions rather than any chemical or physical property of the mineral itself. Hollandite belongs to the hollandite supergroup, a family of oxide minerals sharing a tunnel structure in which large cations such as barium occupy channels running through the manganese oxide framework. This structural family includes several related minerals including Cryptomelane, Coronadite, and Manjiroite, which differ primarily in the large cation occupying the tunnel site: barium in Hollandite, potassium in Cryptomelane, lead in Coronadite, and sodium in Manjiroite. Formation and Geological Context Hollandite forms through the oxidation and secondary alteration of manganese-rich materials in a range of geological environments. Primary manganese minerals, deposited originally in sedimentary or hydrothermal settings, undergo chemical transformation when exposed to oxidising conditions, typically near the surface or within weathering profiles. The oxidation of manganite, rhodochrosite, and other manganese-bearing minerals produces a range of secondary manganese oxides, of which Hollandite is one of the more structurally ordered and mineralogically distinct. Within metamorphic environments, manganese-rich layers in sedimentary sequences can recrystallise under heat and pressure, producing Hollandite as part of a broader manganese oxide assemblage. The relatively slow, controlled crystal growth conditions in these environments are responsible for the well-developed fibrous or acicular crystal habits that make Hollandite inclusions in Quartz so visually striking. The formation of Hollandite inclusions within Quartz is a two-stage process. Hollandite crystals develop first within the host rock environment, and subsequently become enclosed as Quartz crystallises around them from silica-rich hydrothermal fluids percolating through the same environment. The Quartz acts as a natural enclosure, protecting the Hollandite from further weathering and providing the optical clarity that allows the inclusions to be seen and appreciated. This encapsulation also gives the inclusions a physical stability they would not possess as surface specimens. Key localities for Hollandite in Quartz include Madagascar, which dominates the current collector market and has produced some of the finest examples of the star-forming radiating inclusion habit, as well as India (particularly Rajasthan), Australia, and parts of southern Africa. Key Physical Properties Property Detail Mineral Group Oxide Category Manganese Oxide Crystal System Tetragonal Hardness 4.5 – 6 Mohs Specific Gravity 4.95 – 5.05 Lustre Metallic to submetallic Fracture Uneven Cleavage Good in one direction Tenacity Brittle Colour Steel grey, black Streak Black to brownish black Formula Ba(Mn⁴⁺,Mn²⁺)₈O₁₆ Safe to Cleanse in Water Not recommended as a standalone mineral; generally safe when fully enclosed in Quartz The specific gravity of approximately 4.95 to 5.05 is notably high, reflecting the dense packing of manganese and barium in the oxide structure and the presence of heavy barium cations within the tunnel channels. This density is considerably greater than the Quartz host (specific gravity 2.65), meaning Hollandite inclusions are significantly denser than the crystal surrounding them. The metallic to submetallic lustre is characteristic of manganese oxide minerals and is directly responsible for the dark, almost reflective appearance of the inclusions within transparent Quartz. The Hollandite Supergroup Understanding Hollandite within its broader mineral family adds useful context for collectors encountering related minerals in the market. The hollandite supergroup is defined by a shared tunnel structure in which chains of manganese oxide octahedra form a framework with channels running through it. These channels are large enough to accommodate sizeable cations, and it is the identity of that channel cation that distinguishes the individual members from one another. Cryptomelane, with potassium in the channel site, is probably the most abundant member and is a common constituent of manganese oxide deposits and weathering crusts worldwide. Coronadite contains lead in the channel and is found in oxidised zones of lead-bearing ore deposits. Manjiroite contains sodium. All share the same fundamental tunnel architecture as Hollandite and can be difficult to distinguish without chemical analysis, which is why many manganese oxide specimens in collections may be labelled as Hollandite when they are technically a related member of the supergroup. For collectors of Hollandite in Quartz, this distinction is largely academic: the visual character of the inclusions is determined primarily by the manganese oxide habit and crystal form rather than by the precise identity of the channel cation. Hollandite as an Inclusion Mineral The most commercially significant and visually distinctive occurrence of Hollandite is as inclusions within Quartz, and it is worth understanding what makes these specimens particularly interesting from a mineralogical perspective. Inclusion minerals in Quartz are relatively common, with Rutile, Tourmaline, Chlorite, and various other minerals frequently found enclosed within transparent silica crystals. What distinguishes Hollandite inclusions is the specific crystal habit they adopt: fine acicular or fibrous crystals that frequently radiate outward from a central point to produce star-like or asteriated forms within the Quartz. These radiating clusters, sometimes spanning several millimetres across within the host crystal, create a pattern that is immediately visually distinctive and has no close parallel among other common inclusion minerals. The star forms can appear as single radiating bursts, as multiple overlapping clusters, or as dispersed constellations of smaller inclusions distributed through the Quartz. The contrast between the opaque black metallic inclusions and the water-clear or slightly milky Quartz host creates a specimen that reads almost like a natural illustration of the night sky preserved in stone. Care and Handling Hollandite as a standalone mineral is not recommended for water cleansing. Manganese oxide minerals are generally stable under normal handling conditions but can be affected by prolonged moisture exposure, and surface integrity of raw Hollandite specimens should be protected. Hollandite enclosed within Quartz is considerably more robust. The Quartz host provides both physical protection and chemical isolation for the inclusions, and these specimens can generally be handled as Quartz would be handled. Brief contact with water is tolerated, though prolonged soaking is not necessary and is best avoided as a general precaution. Clean with a soft dry or lightly damp cloth and dry thoroughly. Store with care to protect any natural Quartz faces or terminations. The hardness of the Quartz host at 7 on the Mohs scale provides good resistance to everyday scratching, though contact with harder minerals should still be avoided. Traditional Associations While this guide focuses on the mineralogy of Hollandite, it is valued in spiritual and mindful practices for its associations with insight, inner vision, and grounded awareness. In crystal traditions it is linked to the Crown and Third Eye Chakras, representing the balance between higher understanding and practical thought. It is commonly used in meditation, quiet reflection, and intentional focus practices. These associations are rooted in cultural and traditional use rather than scientific properties. For a full exploration of how to work with Hollandite spiritually, see our dedicated spiritual guide. Summary Hollandite is a barium manganese oxide mineral whose geological significance extends well beyond its modest standalone occurrence. As an inclusion within Quartz it produces some of the most visually distinctive specimens available to collectors, with radiating black fibrous crystals forming star-like patterns within transparent silica that record a two-stage geological history of manganese oxide crystallisation followed by Quartz enclosure. Its membership of the hollandite supergroup connects it to a broader family of structurally related manganese oxide minerals found in weathering profiles and ore deposits worldwide, while its specific occurrence in Madagascan and Indian metamorphic terranes has made it a recognisable and sought after presence in the collector market. Shop all Hollandite 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 Clear Quartz: The Mineral Inside Your Watch, Your Phone, and Your Collection Black Tourmaline: The Mineral That Generates Its Own Electricity Hematite: Embrace the Grounding Forces Third Eye Chakra: Crystals and Guidance What Crystal Do I Need? Advanced Crystal Choosing for Crystal Lovers Top 15 Crystals and Stones for Healers

on Nov 14 2025

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