metamorphic
Fuchsite on Quartzite
Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 (Fuchsite), 7 (Quartzite background); Color: Emerald green patches on off-white/grey matrix; Luster: Pearly to vitreous; Crystal structure: Monoclinic (micaceous flakes)
- Hardness
- 2-3 (Fuchsite), 7 (Quartzite background)
- Color
- Emerald green patches on off-white/grey matrix
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (Fuchsite), 7 (Quartzite background); Color: Emerald green patches on off-white/grey matrix; Luster: Pearly to vitreous; Crystal structure: Monoclinic (micaceous flakes)
Formation & geological history
Formed through regional metamorphism of clay-rich sediments containing chromium. The green color is derived from chromium replacing aluminum in the mica structure. Found in Precambrian crystalline schists and quartzites.
Uses & applications
Used as an ornamental stone, in decorative carvings, and a popular specimen for mineral collectors. High-quality pieces are sometimes prepared as cabochons for jewelry.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. It is essentially a green variety of muscovite mica. Highly micaceous versions are often referred to as 'green glimmer'.
Field identification & locations
Identified by its distinctive emerald-green, flaky mica appearance against a hard, granular quartz matrix. Commonly found in Brazil, India, and South Africa. Collectors should look for the characteristic 'sparkle' of the mica flakes when rotated.
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