metamorphic
Fuchsite in Quartz
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz (SiO2)
Hardness: 6-7 (overall due to quartz matrix; Fuchsite itself is 2-3). Color: Emerald green to seafoam green patches in a white/grey matrix. Luster: Vitreous to pearly. Crystal Structure: Monoclinic (fuchsite) within Hexagonal (quartz). Cleavage: Perfect micaceous in the green areas.
- Hardness
- 6-7 (overall due to quartz matrix
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (overall due to quartz matrix; Fuchsite itself is 2-3). Color: Emerald green to seafoam green patches in a white/grey matrix. Luster: Vitreous to pearly. Crystal Structure: Monoclinic (fuchsite) within Hexagonal (quartz). Cleavage: Perfect micaceous in the green areas.
Formation & geological history
Formed through regional metamorphism of rocks containing chromium, often found in phyllites or schists. The green color is derived from chromium trivalent ions replacing aluminum in the mica structure.
Uses & applications
Mainly used as a decorative stone, lapidary material for cabochons, and by mineral collectors. It is also significant in metaphysical circles.
Geological facts
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs. When fuchsite is heavily concentrated in a quartzite matrix, the rock is known as Verdite.
Field identification & locations
Identify by looking for characteristic micaceous emerald-green flakes or patches embedded in a harder, translucent or white quartz matrix. Common in Brazil, Russia, and India.
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