Minerals, Crystals, and Geology

A master collection of mineralogical guides — covering classification, identification by photo, rare crystal finds, and expert geological insights.

Gemstones & Rare Crystals

Embark on a journey through the world's most exquisite gemstones. From the vibrant depths of emeralds and rubies to the intricate patterns of agate, our expert hub offers professional identification guides and collection tips.

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Latest Articles

Obsidian vs. Slag Identification

Malachite: Spot the Fakes

Pyrite vs. Gold Guide

Yellow & Color-Changing Stones

Interactive guide to identifying minerals by color, luster, and hardness. Find out what stone you have.

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How to Identify Minerals with Your Smartphone

Stop guessing and start identifying. This beginner's guide reveals the rapid 1-2-3 triple-photo workflow to get professional-grade mineral identification at home using just your phone and the Minerals Guide app.

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How to Photograph Minerals for AI Identification

Unlock the secrets of professional mineral photography and take your collection cataloging to the next level. This comprehensive masterclass covers the essential 'Standard Three' technique—Overview, Macro, and Transmitted Light—that provides the data density required for precision AI identification. From DIY lighting diffusers to advanced macro hacks and geode internal optics, learn how to capture every crystalline detail with museum-grade clarity using just your smartphone.

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