metamorphic
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
Hardness: 2-3 (Mohs scale), Color: Emerald green to silvery-green, Luster: Pearly to vitreous (often sparkly), Crystal Structure: Monoclinic (micaceous platey habit), Cleavage: Perfect basal cleavage, Specific Gravity: 2.8-2.9
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Emerald green to silvery-green, Luster: Pearly to vitreous (often sparkly), Crystal Structure: Monoclinic (micaceous platey habit), Cleavage: Perfect basal cleavage, Specific Gravity: 2.8-2.9
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks or hydrothermally altered ultramafic rocks. The green color comes from chromium replacing aluminum in the mica structure. Found in metamorphic terranes worldwide.
Uses & applications
Primarily used as an ornamental stone, in decorative carvings, and as a popular specimen for mineral collectors. Sometimes used in folk medicine (healing crystals) or as a minor chromium source.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is essentially a green variety of muscovite mica. High-quality green varieties mixed with ruby are known as 'Ruby in Fuchsite.'
Field identification & locations
Identified by its distinctive green color and the way it flakes into tiny, sparkling scales. Look for it in high-grade metamorphic zones near quartz or kyanite deposits. Commonly found in Brazil, India, and South Africa.
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