metamorphic
Fuchsite or Green Mica Schist
K(Al,Cr)2(AlSi3O10)(OH)2
Hardness 2-3 (Mohs), emerald-green color due to chromium, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage, specific gravity 2.82-2.88.
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Physical properties
Hardness 2-3 (Mohs), emerald-green color due to chromium, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage, specific gravity 2.82-2.88.
Formation & geological history
Formed by regional metamorphism of rocks rich in chromium. Often found in phyllites and schists where chromium-bearing fluids have altered mica content during intense heat and pressure.
Uses & applications
Mainly used as a decorative stone, in jewelry as cabochons, and as a collector's mineral specimen. In industry, it can be a minor source of chromium.
Geological facts
Fuchsite is actually a chromium-rich variety of Muscovite. The green color is highly dependent on the chromium content; without it, the mineral would be clear or silver-white.
Field identification & locations
Identify by its distinctive flaky mica-like structure and shimmering green color. It is commonly found in metamorphic belts internationally, notably in Brazil, India, and Russia.
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