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, Specific gravity: 2.80-2.88
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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, Specific gravity: 2.80-2.88
Formation & geological history
Forms in metamorphic rocks, particularly phyllites and schists, through the regional metamorphism of clay-rich sediments containing chromium. Its green color is derived from chromium atoms replacing aluminum in the mica structure.
Uses & applications
Primarily used as an ornamental stone, a collector's specimen, and occasionally crushed to create glittery pigments. It is also significant in the metaphysical/healing stone market.
Geological facts
Fuchsite is often associated with the 'Ruby in Fuchsite' variety, where distinct red corundum crystals are embedded in the green mica matrix. It is named after the German chemist and mineralogist Johann Nepomuk von Fuchs.
Field identification & locations
Identified by its distinctive micaceous (shimmery, flaky) habit and bright green hue. It is commonly found in Brazil, India, Russia, and South Africa. Collectors should look for its characteristic plates and intense sparkle under light.
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Potassium Feldspar (Orthoclase)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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