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
General
Category
Silicate mineral
Crystal system
Monoclinic
Identification
Color
Light to medium green
Crystal habit
Curved aggregates
Cleavage
Perfect basal
Fracture
Uneven
Mohs scale hardness
2.5
Luster
Vitreous to pearly
Streak
White
Diaphaneity
Transparent to opaque
Specific gravity
2.8–2.9
Optical properties
Biaxial (–)
Refractive index
1.552–1.615
Birefringence
0.036
Dispersion
weak
References
[1]
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 K(Al,Cr)2(AlSi3O10)(OH)2.[2]
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.
Verdite is a type of metamorphic rock made mostly of an impure, often multicolored, variety of fuchsite. It is used for ornamental carvings.
Fuchsite is named after the German chemist and mineralogist Johann Nepomuk von Fuchs.
^Ronald Louis Bonewitz. Rock and Gem (1st American ed.). DK Publishing. p. 263. ISBN 978-0-7566-3342-4.
Fuchsite, also known as chrome mica, is a chromium (Cr)-rich variety of the mineral muscovite, belonging to the mica group of phyllosilicate minerals,...
but it can also be orange, brown, yellow, blue, or grey. Chrome-bearing fuchsite (a variety of muscovite mica) is the classic inclusion and gives a silvery...
influence the material's body colour. In aventurine quartz chrome-bearing fuchsite produces a green stone, and various iron oxides produce a red stone. The...
crystal system is monoclinic. The green, chromium-rich variety is called fuchsite; mariposite is also a chromium-rich type of muscovite. Muscovite is the...
Karnataka is also a major producer of felsite, molding sand (63%), and fuchsite quartzite (57%) in the country. Karnataka has two major centers of gold...
Glaucophane Bleu Gemm glaucophane with fuchsite General Category Inosilicates Sodic amphibole group Formula (repeating unit) ☐Na2(Mg3Al2)Si8O22(OH)2 IMA...
belts that comprise the Central Slave Cover Group consists largely of fuchsite-bearing quartz arenite,. These quartz arenites are associated with chert-magnetite...
two green stones found in Africa A variety of serpentinite A variety of fuchsite This disambiguation page lists articles associated with the title Verdite...
(often of a rusty red colour), carbonate, serpentine, talc, ± mariposite/fuchsite (i.e., Cr-muscovite) ± gold. Geologists[who?] are still[when?] studying...
banded iron formation(BIF), sillimanite/kyanite bearing quartzite and fuchsite quartzite occurring within the Peninsular Gneissic Complex of Attappadi...
co-describer of the mineral mesolite (1816). A variety of muscovite called fuchsite commemorates his name. Über die Entstehung der Porzellan-Erde, 1821 [On...
the rock is the result of chromium in the mica which is also known as fuchsite. The original sedimentary rock from which the quartzite formed was a quartz-rich...
Cu5Pb5Bi7S18 – Austrian geologist Othmar Michael Friedrich (1902–1991) Fuchsite (variety of muscovite): K(Al,Cr)3Si3O10(OH)2 – German mineralogist and...
muscovite. It is notable for tourmaline-rich zones containing accessory fuchsite, purple muscovite, epidote, clinozoisite, zoisite, thulite, tremolite,...
rock samples from the Sumgin Buttress very from c. 268 million years for fuchsite, quartz schist to c. 434 million years for whole rock and amphibolite....
the thermos flask, c. 1892. Mount Dewar rock types include fine-grained fuchsite quartzite, with a very low proportion of mica, which occurswith amphibolite...
sedimentary rocks in eastern Hebei and few in Anshan. Biotite schist, fuchsite quartzite and paragneiss recorded an isotopic age of 3.88–3.55 billion...
87. 1986 F. Chao, C.M. Farrow & B.E. Leake. Polydymite and chrome-rich fuchsite in virginite from Baie Verte, Newfoundland. Mineral. Mag. 50, 723–4. 88...
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