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.

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Aquamarine: The Iron Chemistry Behind the Sea-Blue Beryl

by Laura Konst

Aquamarine and Emerald are the same mineral. Both are Beryl, a beryllium cyclosilicate, distinguished only by the trace elements that colour them: chromium for Emerald's green, iron for Aquamarine's blue. The specific oxidation state of that iron determines whether the result is blue, yellow, or green, and most commercial Aquamarine has been heat-treated to shift the iron into the blue-producing state. This guide explores the pegmatite geology, the iron colour chemistry, and two thousand years of human history with one of the most enduringly valued blue gemstones on Earth.

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