mineral

Fuchsite

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

AI-generated identification · may be incorrect

Hardness: 2-2.5 on Mohs scale. Color: Emerald green to pale apple green. Luster: Pearly to silky or vitreous. Crystal Structure: Monoclinic, typically micaceous/foliated mass. Cleavage: Perfect basal cleavage, breaking into flexible sheets.

Hardness: 2-2
Color: Emerald green to pale apple green
Luster: Pearly to silky or vitreous

Identified July 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms during low-grade regional or hydrothermal metamorphism of ultramafic rocks or chromium-rich sediments, where chromium replaces aluminum in the muscovite mica structure.

Uses & applications

Popular as an ornamental stone, mineral specimen for collectors, carved figurines, and gemstone cabochons (especially when combined with ruby as Ruby in Fuchsite).

Geological facts

The intense emerald-green color of fuchsite comes from trace amounts of chromium (Cr3+). It is named after the German mineralogist Johann Nepomuk von Fuchs.

Field identification & locations

Identified by its bright green color and classic mica-like flaky/foliated texture. Commonly found in Brazil, India, Madagascar, Russia, and South Africa. Easily scratched with a fingernail or copper coin.