mineral

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

AI-generated identification · may be incorrect

Hardness: 2-3 (Mohs scale), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal structure: Monoclinic (often micaceous/flaky), Cleavage: Perfect basal (peels into thin sheets), Specific gravity: 2.77-2.88

Identified May 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in metamorphic rocks, particularly schist and gneiss, through the regional metamorphism of clay-rich sediments. The intense green color is caused by chromium replacing some of the aluminum in the mica structure.

Uses & applications

Primarily used as an ornamental stone, for carving small figurines, and in jewelry (often as cabochons). It is also a popular collector mineral due to its vibrant color and glittery appearance.

Geological facts

Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. When fuchsite is found as a primary component in quartzite, the rock is known as Aventurine.

Field identification & locations

Identify in the field by its distinct emerald green color, micaceous (sheet-like) habit that flakes easily with a fingernail, and its pearly luster. Commonly found in Brazil, India, Russia, and South Africa.