mineral
Fuchsite (Green Muscovite)
Fuchsite (Chromium-rich Muscovite), K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 (Mohs scale), Color: Emerald green to pale green, Luster: Vitreous to pearly, Crystal structure: Monoclinic (often appearing as scaly aggregates), Cleavage: Perfect basal cleavage, Specific gravity: 2.7-3.0
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Emerald green to pale green, Luster: Vitreous to pearly, Crystal structure: Monoclinic (often appearing as scaly aggregates), Cleavage: Perfect basal cleavage, Specific gravity: 2.7-3.0
Formation & geological history
Formed through regional metamorphism; often found in phyllites or schists where chromium-bearing fluids interact with mica minerals during rock transformation.
Uses & applications
Primarily used as an ornamental stone, a pigment in green paints or cosmetics, and as a popular specimen for mineral collectors. Some transparent varieties are carved.
Geological facts
Fuchsite is the chromium-rich variety of muscovite mica. High-quality specimens with ruby inclusions are known as 'Ruby in Fuchsite' and are highly prized by collectors for the color contrast.
Field identification & locations
Identified in the field by its distinctive emerald-green color, micaceous (flaky) texture, and softness—it can often be scratched with a fingernail or copper coin. Common in Brazil, India, and Russia.
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Potassium Feldspar (Orthoclase)
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Epidote
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