metamorphic

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

AI-generated identification · may be incorrect

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

Identified July 18, 2026More metamorphic →

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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.