mineral
Fuchsite
Cr-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 2-3 (Mohs scale), Color: Emerald green to pale green, Luster: Pearly to vitreous, Crystal structure: Monoclinic, Cleavage: Perfect basal micaceous
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Emerald green to pale green, Luster: Pearly to vitreous, Crystal structure: Monoclinic, Cleavage: Perfect basal micaceous
Formation & geological history
Formed in chromium-rich metamorphic rocks, specifically in phyllites and schists where hydrothermal activity has introduced chromium into the mica structure.
Uses & applications
Primarily used as a decorative stone, as a pigment in paints (historical), and as a mineral specimen for collectors.
Geological facts
Fuchsite is named after the German chemist Johann Nepomuk von Fuchs. Its vivid green color comes from chromium replacing aluminum in the crystal lattice.
Field identification & locations
Identified by its distinctive green color and micaceous, flaky 'glittery' texture. Commonly found in Brazil, India, and South Africa. Easily scratched with a fingernail or copper coin.
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