mineral

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - 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 (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.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral