mineral

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; Cleavage: Perfect basal; Specific Gravity: 2.8-2.9

Hardness: 2-3 Mohs
Color: Emerald green to pale green
Luster: Pearly to vitreous

Identified June 11, 2026More mineral →

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Physical properties

Hardness: 2-3 Mohs; Color: Emerald green to pale green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.8-2.9

Formation & geological history

Formed through regional metamorphism. It is a chromium-rich variety of muscovite mica, commonly found in phyllites and schists where chromium-rich minerals have been altered by hydrothermal activity.

Uses & applications

Primarily used as an ornamental stone, a collector's mineral, and in the production of metaphysical or decorative items. Occasionally used in paint pigments.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. Its vivid green color comes from trivalent chromium replacing some of the aluminum in the crystal structure.

Field identification & locations

Identify in the field by its distinct green color and the way it flakes into flexible, glittery sheets. It is often found in Brazil, India, and Zimbabwe. Collectors should look for the characteristic micaceous sheen.