metamorphic
Fuchsite (Green Muscovite in Quartz)
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 2-3 (mica) though often 7 in quartz matrix; 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 (mica) though often 7 in quartz matrix
- Color
- Emerald green to light green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (mica) though often 7 in quartz matrix; 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 the regional metamorphism of rocks rich in chromium. It is a phyllosilicate mineral commonly found in schists and gneisses, often associated with hydrothermal activity in quartz veins.
Uses & applications
Used primarily as decorative stone, in jewelry as cabochons or beads, and as a source of chromium. It is also a popular specimen for gemstone collectors and metaphysical practitioners.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. When tiny flakes of fuchsite are suspended in quartz, it creates the gemstone known as Green Aventurine.
Field identification & locations
Identify in the field by its distinct forest-to-emerald green color and micaceous sheen. It is common in areas with metamorphic activity such as Brazil, India, and parts of the United States like New Hampshire.
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