metamorphic
Fuchsite Schist
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
Hardness: 2-3 (Mohs scale); Color: Emerald green to blue-green; Luster: Pearly to vitreous; Crystal structure: Monoclinic, typically micaceous/platy; Density: 2.8 g/cm3.
- Hardness
- 2-3 (Mohs scale)
- Color
- Emerald green to blue-green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (Mohs scale); Color: Emerald green to blue-green; Luster: Pearly to vitreous; Crystal structure: Monoclinic, typically micaceous/platy; Density: 2.8 g/cm3.
Formation & geological history
Formed through regional metamorphism of phyllites and schists, where chromium is present during the crystal growth of muscovite mica. Found in metamorphic rocks from the Precambrian era to more recent orogenic events.
Uses & applications
Used primarily as a decorative stone, in jewelry (often as cabochons), as a source of chromium, and highly valued by mineral collectors for its vibrant color.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. The intense green color is caused by trivalent chromium substituting for aluminum in the mica structure.
Field identification & locations
Look for a distinct 'shimmer' or 'glitter' caused by tiny mica flakes and a vibrant green color. Often found near chromium-rich ultramafic rocks or in proximity to gold deposits.
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