mineral
Fuchsite
Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 (Mohs). Color: Emerald green to sea foam green. Luster: Pearly to vitreous. Crystal Structure: Monoclinic (usually appearing in micaceous foliated masses). Cleavage: Perfect basal cleavage (flakes easily). Specific Gravity: 2.8 - 2.9.
- Hardness
- 2-3 (Mohs)
- Color
- Emerald green to sea foam green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (Mohs). Color: Emerald green to sea foam green. Luster: Pearly to vitreous. Crystal Structure: Monoclinic (usually appearing in micaceous foliated masses). Cleavage: Perfect basal cleavage (flakes easily). Specific Gravity: 2.8 - 2.9.
Formation & geological history
Forms in metamorphic rocks, particularly phyllites and schists, as a result of regional metamorphism of sediments containing chromium or through hydrothermal alteration. Often associated with quartz or carbonate rocks.
Uses & applications
Primarily used as a lapidary material for decorative carvings, cabochons, and as a collector's specimen. It is also ground up for use as a pigment in paints and as a glittery lubricant.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. Its vivid green color comes from chromium substituting for aluminum in the mica structure. When combined with ruby, it forms the popular decorative rock known as Ruby in Fuchsite.
Field identification & locations
Identify by its characteristic bright green mica-like flaking and pearly luster. Look for it in metamorphic terrains globally, notably in Brazil, India, and parts of the United States. It can be distinguished from chlorite by its higher translucency and brighter color.
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