mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 2-3 (Mohs scale), Color: Emerald green to light green, Luster: Pearly to vitreous, Crystal Structure: Monoclinic, Cleavage: Perfect basal, Specific Gravity: 2.8-3.0
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Emerald green to light green, Luster: Pearly to vitreous, Crystal Structure: Monoclinic, Cleavage: Perfect basal, Specific Gravity: 2.8-3.0
Formation & geological history
Formed through regional metamorphism in phyllites and schists, or occasionally in hydrothermal environments. The green color is derived from chromium substituting for aluminum in the mica structure.
Uses & applications
Mainly used as a decorative stone, in jewelry (often when found within white quartz), as a source of pigment, and highly sought after by mineral collectors.
Geological facts
Fuchsite is named after the German chemist Johann Nepomuk von Fuchs. It is a variety of Muscovite. When it occurs with massive rubies, the rock is known as Ruby in Fuchsite.
Field identification & locations
Identify by its sparkly, micaceous (flakey) appearance and distinct green hue. Often found in South Africa, Russia, Brazil, and India. It is much softer than quartz or emeralds.
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