metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2
Hardness: 2.5-3 for Fuchsite, 7 for Quartz matrix; Color: Emerald green to pale green inclusions in white/translucent matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic (Fuchsite), Trigonal (Quartz); Specific Gravity: 2.6 - 2.9
- Hardness
- 2
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2.5-3 for Fuchsite, 7 for Quartz matrix; Color: Emerald green to pale green inclusions in white/translucent matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic (Fuchsite), Trigonal (Quartz); Specific Gravity: 2.6 - 2.9
Formation & geological history
Formed via regional metamorphism within phyllites and schists. The green color is derived from chromium substituting for aluminum in the muscovite mica structure. These deposits are typically of Precambrian to Paleozoic age.
Uses & applications
Primarily used as an ornamental stone, for lapidary work (cabochons), as an aesthetic collector specimen, and in the metaphysical gemstone market.
Geological facts
Fuchsite is a chromium-rich variety of muscovite mica. It is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. This specific combination is often called 'Green Aventurine' if the inclusions are dense enough to cause a shimmering effect known as aventurescence.
Field identification & locations
Identify in the field by the distinct bright green flaky scales (mica) embedded within hard, crystalline quartz. Commonly found in Brazil, India, Zimbabwe, and Russia. Collectors look for the high contrast between the green chromium-mica and the white quartz.
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