metamorphic
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 2-3 Mohs; Color: Pale to emerald green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.88
- Hardness
- 2-3 Mohs
- Color
- Pale to emerald green
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 Mohs; Color: Pale to emerald green; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.88
Formation & geological history
Formed through the regional metamorphism of clay-rich sediments or the hydrothermal alteration of ultramafic rocks, where chromium replaces some aluminum in the muscovite structure.
Uses & applications
Primarily used as an ornamental stone, for carving, in jewelry (cabochons), and for healing stone/metaphysical collections.
Geological facts
Fuchsite is the chromium-rich variety of muscovite mica. It is responsible for the green color and spangled 'aventurescence' effect in green aventurine quartz.
Field identification & locations
Identify by its soft, flaky (micaceous) texture and shimmering green color. Commonly found in Brazil, India, Zimbabwe, and the Ural Mountains in Russia.
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