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.

All articles Aegirine Agate Alexandrite Almandine Garnet Amazonite Amber Amethyst Ammonite Analcime Angelite Anhydrite Anthraxolite Apophyllite Aquamarine Aragonite Aragonite Sputnik Asterism Azurite Beginners Guide Beryl Birefringence Black Obsidian Black Tourmaline Blog Post Blue Aragonite Blue Calcite Blue Halite Blue Kyanite Boulder Opal Calcite Caribbean Calcite Carnelian Chalcedony Chalcopyrite Charoite Chatoyancy Chlorite Chlorite Quartz Chrysocolla Chrysoprase Citrine Clear Quartz Cleavage Cobalto Calcite Cobaltoan Calcite Copal Copper Crystal Habit Crystal System Crystals Dispersion Fancy Jasper Feldspar Ferruginous Quartz Fire Quartz Flower Agate Fluorescence Fluorite Fossil Fracture Fuchsite Fulgurite Garnet Golden Healer Quartz Grape Agate Green Fuchsite Green Tourmaline Gypsum Hackmanite Halite Hematite Hematoid Quartz Herkimer Diamond Heulandite Hollandite Imperial Topaz Indicolite Iolite Jasper Kämmererite kunzite Labradorite Lapis Lazuli Larimar Lazurite Lepidolite Lightning Lodalite Lustre Mahogany Obsidian Malachite Manganese Mangano Calcite Mica Minerology Mohs Scale of Hardness Mookaite Muscovite Natrolite Obsidian Ocean Jasper Permineralized Wood Picture Jasper Pietersite Pink Halite Pleochroism Prehnite Pyrite Quartz Red Jasper Refractive Index Rhodochrosite Rhodonite Rubellite Tourmaline Satin Spar Scolecite Selenite Seraphinite Smokey Quartz Sodalite Stilbite Streak Sugilite Sulphur Tanzanite Tenacity Tinaksite Topaz Tourmaline Transparency Turquoise Unakite Uvarovite Vanadinite Yellow Calcite Zebra Calcite Zeolite Zoisite

A Beginner's Guide to Mineral Optical Properties

by Laura Konst

Every mineral guide in the Mineral Vault references optical properties; colour, lustre, refractive index, birefringence, pleochroism, fluorescence, dispersion, chatoyancy, and asterism, but what do those terms actually mean? This second guide in our Mineralogy series explains each optical property clearly and practically, covering how light interacts with crystal structure to produce everything from the fire in a diamond to the cat’s eye in Tiger’s Eye. Whether you are just starting your collection or want to understand what you are already looking at, this is the place to begin.

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The Crystal and Mineral Vault

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