metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
Hardness: 6.5-7 (Quartz matrix), 2-3 (Fuchsite inclusions); Color: Pale green to emerald green inclusions in gray/translucent matrix; Luster: Vitreous to pearly; Crystal Structure: Monoclinic (Fuchsite)/Trigonal (Quartz); Cleavage: Perfect mica-like in inclusions.
- Hardness
- 6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6.5-7 (Quartz matrix), 2-3 (Fuchsite inclusions); Color: Pale green to emerald green inclusions in gray/translucent matrix; Luster: Vitreous to pearly; Crystal Structure: Monoclinic (Fuchsite)/Trigonal (Quartz); Cleavage: Perfect mica-like in inclusions.
Formation & geological history
Formed through regional metamorphism where chromium-rich hydrothermal fluids interact with existing aluminum-rich rocks. Often found in Precambrian metamorphic terrains such as greenstone belts.
Uses & applications
Used primarily as decorative gemstones, cabochons for jewelry, and lapidary rough for ornamental carvings and sphere making. It is also a popular specimen for crystal collectors.
Geological facts
Fuchsite is a chromium-rich variety of muscovite mica; the presence of chromium gives it its vibrant green color. It is often confused with Aventurine, but Aventurine usually has more evenly distributed mica flakes.
Field identification & locations
Identify in the field by looking for distinct green mica 'shimmer' or flakes embedded within a harder quartz matrix. Common locations include Brazil, India, Zimbabwe, and Russia.
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