metamorphic
Fuchsite
Muscovite (chromium-rich), K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 Mohs; Color: Pale green to emerald green; Luster: Pearly to vitreous; Crystal structure: Monoclinic (usually micaceous flakes); Cleavage: Perfect basal; Specific Gravity: 2.7-3.0
- Hardness
- 2-3 Mohs
- Color
- Pale green to emerald green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 Mohs; Color: Pale green to emerald green; Luster: Pearly to vitreous; Crystal structure: Monoclinic (usually micaceous flakes); Cleavage: Perfect basal; Specific Gravity: 2.7-3.0
Formation & geological history
Formed in phyllites and schists through low-grade regional metamorphism. The emerald green color is caused by trivalent chromium replacing aluminum in the muscovite structure.
Uses & applications
Primarily used as an ornamental stone, for carving, in jewelry (especially when as Aventurine), and as a minor ore of chromium. Popular among mineral collectors.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is the chromium-rich variety of muscovite mica and can sometimes contain rubies (Ruby in Fuchsite).
Field identification & locations
Identify by its distinct green color and micaceous, flaky 'glitter' texture. Common in metamorphic belts in Brazil, South Africa, and India. Collectors value specimens with high luster and vivid color.
