mineral
Fuchsite
Chromium-rich Muscovite Mica
Hardness: 2-2.5. Color: light to dark emerald green. Luster: Pearly to vitreous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction, forming thin sheets.
- Hardness
- 2-2
- Color
- light to dark emerald green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-2.5. Color: light to dark emerald green. Luster: Pearly to vitreous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction, forming thin sheets.
Formation & geological history
Formed in metamorphic environments, specifically in phyllites and schists where chromium is present during regional metamorphism.
Uses & applications
Used primarily as a collector's mineral and sometimes in lapidary work for carvings or cabochons. It is also an important indicator mineral for chromium deposits.
Geological facts
Fuchsite gets its green color from the substitution of trivalent chromium for aluminum within the muscovite structure. When mixed with corundum (ruby), it forms the popular decorative rock 'ruby in fuchsite'.
Field identification & locations
Identified by its distinctive sparkly green micaceous appearance, softness, and typical occurrence in metamorphic rocks. Commonly found in Brazil, India, and parts of Africa.
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