mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 2-3 (Mohs), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Perfect basal, Specific gravity: 2.8 - 3.0
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Physical properties
Hardness: 2-3 (Mohs), Color: Emerald green to light green, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Perfect basal, Specific gravity: 2.8 - 3.0
Formation & geological history
Formed primarily in metamorphic rocks like phyllites and mica schists through regional metamorphism. The distinctive green color comes from chromium substituting for aluminum within the crystal lattice.
Uses & applications
Used as an ornamental stone, a pigment in paints (mica flake), and widely sold as a metaphysical or collector specimen. It is often included as an ingredient in aventurine quartz.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is a variety of Muscovite mica and can sometimes contain inclusions of corundum (ruby), creating 'Ruby in Fuchsite'.
Field identification & locations
Identified in the field by its glittering, flaky micaceous texture and vibrant green color. Commonly found in Brazil, India, Russia, and South Africa. Collectors should look for the characteristic 'sparkle' of mica plates.
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