mineral

Fuchsite (Chrome Mica)

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

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

Hardness: 2-3 (Mohs scale)
Color: Emerald green to light green
Luster: Vitreous to pearly

Identified July 18, 2026More mineral →

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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.