mineral
Fuchsite (Chrome Mica)
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 (micaceous/flaky cleavage); Specific Gravity: 2.8 - 2.9
- Hardness
- 2-3 (Mohs scale)
- Color
- Emerald green to light green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2-3 (Mohs scale); Color: Emerald green to light green; Luster: Vitreous to pearly; Crystal structure: Monoclinic (micaceous/flaky cleavage); Specific Gravity: 2.8 - 2.9
Formation & geological history
Metamorphic mineral formed primarily in phyllites and schists, often through hydrothermal alteration of ultramafic rocks or chromium-bearing minerals.
Uses & applications
Primarily used as a minor source of chromium, for carving ornamental objects, as a pigment, and as a popular specimen for gemstone and mineral collectors.
Geological facts
Fuchsite gets its vibrant green color from impurities of chromium replacing aluminum in the mica structure. It is named after the German chemist and mineralogist Johann Nepomuk von Fuchs.
Field identification & locations
Identify in the field by its distinct green color, flaky/micaceous habit, and low hardness (easily scratched by a fingernail). Commonly found in Brazil, India, Russia, and Madagascar.
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