metamorphic
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 (Mohs). Color: Emerald green to pale green. Luster: Pearly to vitreous. Crystal structure: Monoclinic (micaceous/foliated). Specific gravity: 2.8-3.0.
- Hardness
- 2-3 (Mohs)
- Color
- Emerald green to pale green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (Mohs). Color: Emerald green to pale green. Luster: Pearly to vitreous. Crystal structure: Monoclinic (micaceous/foliated). Specific gravity: 2.8-3.0.
Formation & geological history
Formed in low-to-medium grade metamorphic rocks, particularly phyllites and schists, where chromium replaces aluminum in the muscovite lattice. Often found in Precambrian terrains.
Uses & applications
Used primarily as an ornamental stone, as an ingredient in artisanal soaps or cosmetics (due to its sparkle), and as a minor gemstone when found within 'ruby in fuchsite' specimens.
Geological facts
Fuchsite is a chromium-rich variety of muscovite mica. Its distinct green color is caused by trace amounts of trivalent chromium. It is often confused with chlorite, but fuchsite has a much stronger pearly luster and more vibrant green hue.
Field identification & locations
Identify in the field by its distinct green color, micaceous 'glittery' appearance, and the way it peels in thin, flexible flakes. Commonly found in Brazil, India, Zimbabwe, and Russia.
