fuchsite

Fuchsite, also known as chrome mica, is a chromium (Cr)-rich variety of the mineral muscovite, belonging to the mica group of phyllosilicate minerals, with the chemical formula .

Key facts

Mineral.name: Fuchsite
Mineral.category: Phyllosilicate minerals
Mineral.group: Mica group, dioctahedral mica group
Mineral.IMAstatus: Variety of muscovite
Mineral.image: Verdite (microcrystalline fuchsite metamorphite) South Africa.jpg
Mineral.caption: Verdite, a microcrystalline metamorphic rock, is composed mostly of green fuchsite. This specimen (6.5 cm across at its base), of Archean age, is from Barberton, Mpumalanga, South Africa
Mineral.system: Monoclinic
Mineral.color: Light to medium green
Mineral.habit: Curved aggregates
Mineral.cleavage: Perfect basal
Mineral.fracture: Uneven
Mineral.mohs: 2.5
Mineral.luster: Vitreous to pearly
Mineral.refractive: 1.552–1.615
Mineral.opticalprop: Biaxial (–)
Mineral.birefringence: 0.036
Mineral.dispersion: weak
Mineral.streak: White

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Wikidata facts

Image: Verdite (microcrystalline fuchsite metamorphite) South Africa.jpg

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Commons category: Fuchsite

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Fuchsite, also known as chrome mica, is a chromium (Cr)-rich variety of the mineral muscovite, belonging to the mica group of phyllosilicate minerals, with the chemical formula .

Trivalent chromium replaces one of the aluminium (Al) atoms in the general muscovite formula producing the apple green hue distinctive of fuchsite. It is often found in minute micaceous aggregates (with individual plates barely visible), as a major component of chromium rich phyllitic or schistose metamorphic rocks of the greenschist facies.