Metamorphic Rock / Mineral Association
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
Fuchsite (green muscovite mica) has a Mohs hardness of 2-2.5, pearly to vitreous luster, monoclinic crystal structure, perfect cleavage. Quartz has a hardness of 7, vitreous luster, hexagonal crystal structure, conchoidal fracture. Color is pale to emerald green (fuchsite) mixed with white/clear (quartz).
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Physical properties
Fuchsite (green muscovite mica) has a Mohs hardness of 2-2.5, pearly to vitreous luster, monoclinic crystal structure, perfect cleavage. Quartz has a hardness of 7, vitreous luster, hexagonal crystal structure, conchoidal fracture. Color is pale to emerald green (fuchsite) mixed with white/clear (quartz).
Formation & geological history
Formed through regional metamorphism of chromium-bearing rocks, often associated with hydrothermal alteration. Geologically found in metamorphic terranes.
Uses & applications
Used primarily as an ornamental stone, for lapidary work (cabochons, carvings), and collected by mineral enthusiasts. Occasionally used for its chromium content.
Geological facts
Fuchsite gets its green color from trivalent chromium replacing aluminum in the muscovite structure. It is sometimes trade-named 'Green Muscovite'.
Field identification & locations
Identified by the distinct sparkly, flaky green patches (fuchsite mica) embedded in harder, typically white or translucent quartz. Common in Brazil, India, and parts of the USA.
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