metamorphic
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
Hardness: 7 (quartz) and 2-3 (fuchsite inclusions); Color: White to grey with emerald green streaks; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Specific Gravity: Approx 2.65-2.8
- Hardness
- 7 (quartz) and 2-3 (fuchsite inclusions)
- Color
- White to grey with emerald green streaks
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (quartz) and 2-3 (fuchsite inclusions); Color: White to grey with emerald green streaks; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Specific Gravity: Approx 2.65-2.8
Formation & geological history
Formed under regional metamorphism where chromium-rich minerals interact with silica-rich fluids. Often found in Precambrian metamorphic terrains such as greenstone belts.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons, and as a collector's specimen. In metaphysical communities, it is often used as a 'healing' stone.
Geological facts
The green color in the muscovite (fuchsite) is caused by small amounts of trivalent chromium replacing aluminum in the crystal lattice. When it occurs in massive quartz, it is often called 'Green Aventurine' if the inclusions are abundant enough to create a shimmering effect.
Field identification & locations
Identify by the distinct bright green mica flakes or 'clouds' hosted within translucent white to milky quartz. It can often be found near chromium-rich ultramafic rocks or in schist formations.
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