The Crystal and Mineral Vault


Welcome to our Crystal and Mineral Knowledge Hub, where science tradition and mindful practice come together. This space is dedicated to exploring the formation properties and cultural associations of crystals and minerals through Mineral Vault profiles and practical guides designed to encourage informed discovery and deeper understanding.

Go to our Mineral Guides for science based knowledge and the 'How to Guides' for spiritual practices.

Citrine Tower

The Crystal and Mineral Vault

Citrine: Turns Out Most of It Is Just Amethyst That Got Too Hot

by Laura Konst
Most of the Citrine on the market is heat-treated Amethyst. Natural Citrine is rare, geologically distinct, and looks nothing like the bright orange material sold in crystal shops. This guide covers the iron colour chemistry, the difference between natural and heated material, geological origins, and five thousand years of solar symbolism.
Hollandite in Quartz Specimen

The Crystal and Mineral Vault

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

by Laura Konst
Hollandite is a rare barium manganese oxide mineral, and while it can occur independently, it is the inclusions that make it extraordinary: fine fibrous crystals radiating outward in star-like patterns, preserved inside transparent Quartz like a constellation frozen in stone. This guide explores the geology behind those formations, the manganese oxide supergroup Hollandite belongs to, and what makes these two-stage geological specimens so unlike anything else in a collection.
Unakite Crystals

The Crystal and Mineral Vault

Unakite: Plain Grey Granite Until Hot Fluids Had Other Ideas

by Laura Konst
Unakite is not a mineral but a metamorphic rock: granite that was altered by hot hydrothermal fluids which converted its plagioclase feldspar into green Epidote, leaving the original pink Orthoclase and Quartz intact. Named after the Unaka Mountains of North Carolina, it is one of the more geologically instructive collector rocks available, with a visible mineral alteration story in every specimen.
Amethyst cut base

The Crystal and Mineral Vault

Amethyst: The Stone That Sobered Up Ancient Greeks and Bankrupted the Gem Trade

by Laura Konst
Amethyst was once classified alongside Diamond, Ruby, and Emerald as a cardinal gemstone, reserved for royalty and bishops. Brazilian deposits in the nineteenth century changed that entirely. Today it is the world's most widely collected crystal, its purple colour produced by a radiation-driven iron mechanism that heat destroys — which is also how most commercial Citrine is made.
Chlorite Quartz Crystal

The Crystal and Mineral Vault

Chlorite Quartz: The Green Ghost Inside the Crystal and How It Got There

by Laura Konst
Chlorite Quartz is a two-mineral combination whose visual variety — from phantom-bearing transparent crystals to densely coated green specimens — reflects the range of geological settings in which Quartz and Chlorite come together. The phantom habit is one of the most scientifically instructive crystal growth features in the collector mineral world, preserving a visual record of interrupted crystal growth spanning millions of years within a single transparent specimen. This guide explores the Chlorite chemistry, the phantom formation process, the full visual range of habits, and how to care for both enclosed and surface-coated specimens.
Citrine Crystal

The Crystal and Mineral Vault

Citrine: Turns Out Most of It Is Just Amethyst That Got Too Hot

by Laura Konst
Most commercial Citrine is not natural Citrine. It is Amethyst that has been heated to around 470 degrees Celsius, converting the purple iron colour centres into yellow ones through a process that is permanent, stable, and widely accepted in the gem trade but not always disclosed at the point of sale. Natural Citrine exists, is genuinely rare, and looks quite different
Lodalite Crystal

The Crystal and Mineral Vault

Lodalite: A Garden Nobody Planted

by Laura Konst
Lodalite is transparent Quartz containing a diverse suite of mineral inclusions, principally Chlorite, Hematite, Goethite, and Feldspar, whose three-dimensional distribution within the crystal creates internal landscapes that resemble gardens, forests, and underwater scenes. No two specimens are identical: each records the specific chemistry of the hydrothermal environment where it formed, with every inclusion layer a chapter of geological history preserved in glass. This guide explores what the inclusions are, how they form, and what distinguishes Lodalite from other included Quartz varieties.
Carnelian Tower

The Crystal and Mineral Vault

Carnelian: The Ancient World's Favourite Orange Gemstone

by Laura Konst
Carnelian has been carved, traded, and worn continuously for over five thousand years, travelling along the earliest known long-distance trade routes from India to Mesopotamia by 3000 BCE. Its orange to reddish-brown colour comes from fine-grained Hematite within a microcrystalline silica matrix, and most commercial material has been heat-treated by a method Indian lapidaries have used for four thousand years. This guide covers the colour chemistry, the heat treatment question, and one of the longest human relationships with any gemstone in the mineral world.
Smokey Quartz Crystal

The Crystal and Mineral Vault

Smokey Quartz: One of Earth's Most Abundant Minerals and Its Most Misunderstood

by Laura Konst
Smokey Quartz owes its characteristic hue to natural radiation and the presence of aluminium impurities. It acts as a protective barrier against nightmares, instils a relaxed state of mind during meditation, and offers clear insights, dispelling worries and thoughts of low self-esteem.
Clear Quartz Crystal

The Crystal and Mineral Vault

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

by Laura Konst
Clear Quartz is the purest form of one of the most abundant minerals on Earth, built from nothing more than silicon and oxygen. But that simplicity is deceptive. The same mineral regulates the frequency in your watch, underpins the semiconductor industry, and produces some of the most visually extraordinary crystals in the natural world. This guide explores the geology, physics, and remarkable variety of Clear Quartz from the ground up.
Grape Agate statement piece

The Crystal and Mineral Vault

Grape Agate: Named After Fruit, Not Quite an Agate, Entirely Fascinating

by Laura Konst
Grape Agate looks exactly like a bunch of grapes. It is not grapes, and strictly speaking it is not technically an Agate either: true Agate is defined by concentric banding, while Grape Agate grows in rounded spherical clusters through a process called botryoidal growth. The purple colour comes from trace manganese within the microcrystalline silica.