mineral
Fuchsite
Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
AI-generated identification · may be incorrectHardness: 2-3 (Mohs scale), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Specific gravity: 2.8 and 2.9
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Specific gravity: 2.8 and 2.9
Formation & geological history
Forms through regional metamorphism. It is a chromium-rich variety of muscovite mica found in phyllites or schists, often where hydrothermal activity has occurred.
Uses & applications
Primarily used as an ornamental stone, in decorative carvings, and as a component in metaphysical jewelry. Occasionally used as a minor chromium source.
Geological facts
The green color is caused by the replacement of aluminum ions with chromium in the crystal lattice. It was named after the German chemist and mineralogist Johann Nepomuk von Fuchs.
Field identification & locations
Identify by its distinct green color and micaceous cleavage (breaks into thin, flexible flakes). Typically found in Brazil, India, and Zimbabwe. Looking for it in high-grade metamorphic rocks.
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