mineral
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 on Mohs scale; Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.8-2.9.
- Hardness
- 2-3 on Mohs scale
- Color
- Emerald green to light green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 on Mohs scale; Color: Emerald green to light green; Luster: Pearly to vitreous; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.8-2.9.
Formation & geological history
Formed through regional metamorphism in phyllites and schists, often associated with hydrothermal activity. Chromium replaces aluminum in the muscovite structure to provide the green color.
Uses & applications
Used primarily as a decorative stone, in jewelry as cabochons, and as a source of chromium in some environments. Also popular among mineral collectors.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. When fuchsite is found as small inclusions in quartz, it creates the aventurine effect (aventurescence).
Field identification & locations
Identify by its distinctive green color and micaceous (sheet-like) cleavage. It often has a glittery appearance. Commonly found in Brazil, India, Zimbabwe, and the Ural Mountains.
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