mineral
Fuchsite
Chromian Muscovite, K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-2.5 on the Mohs scale, Color: Bright emerald green to pale green due to chromium impurities, Luster: Vitreous to pearly, Crystal Structure: Monoclinic, Cleavage: Perfect basal cleavage, Specific Gravity: 2.7-3.1
- Hardness
- 2-2
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Physical properties
Hardness: 2-2.5 on the Mohs scale, Color: Bright emerald green to pale green due to chromium impurities, Luster: Vitreous to pearly, Crystal Structure: Monoclinic, Cleavage: Perfect basal cleavage, Specific Gravity: 2.7-3.1
Formation & geological history
Forms in metamorphic environments, specifically in quartz-muscovite schists and greenschist facies rocks, often associated with hydrothermal alteration in ultramafic rocks.
Uses & applications
Used primarily as a mineral specimen for collectors, in lapidary arts for decorative carvings, and sometimes as a source of mica or chromium.
Geological facts
The distinctive green color of fuchsite comes from trace amounts of chromium replacing aluminum in its crystal structure. It is often referred to as 'green muscovite'.
Field identification & locations
Easily identified by its characteristic bright green micaceous sparkle and flakey texture. Found globally including in Brazil, India, Russia, and the USA.
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