Phyllosilicate mineral member of the chlorite group
Chamosite
A 3.6 by 2.2 cm of Axinite-Fe covered on both sides by greenish microcrystals of Chamosite
General
Category
Phyllosilicate
Formula (repeating unit)
(Fe2+,Mg)5Al(AlSi3O10)(OH)8
IMA symbol
Chm[1]
Strunz classification
9.EC.55
Crystal system
Monoclinic
Crystal class
Prismatic (2/m) (same H-M symbol)
Space group
C2/m
Unit cell
a = 5.37 Å, b = 9.3 Å, c = 14.22 Å; β = 97.88°; Z = 2
Identification
Color
Green, grey-green, black
Mohs scale hardness
3
References
[2][3][4]
Chamosite is the Fe2+end member of the chlorite group. A hydrous aluminium silicate of iron, which is produced in an environment of low-to-moderate-grade metamorphosed iron deposits, as gray or black crystals in oolitic iron ore. Like other chlorites, it is a product of the hydrothermal alteration of pyroxenes, amphiboles and biotite in igneous rock. The composition of chlorite is often related to that of the original igneous mineral, so that more Fe-rich chlorites are commonly found as replacements of the Fe-rich ferromagnesian minerals (Deer et al., 1992).
Chamosite is the Fe2+end member of the chlorite group. A hydrous aluminium silicate of iron, which is produced in an environment of low-to-moderate-grade...
two most common end members, magnesium-rich clinochlore and iron-rich chamosite. In addition, manganese, zinc, lithium, and calcium species are known...
hematite, and magnetite; carbonates, i.e. siderite; silicates, i.e. chamosite; or some combination of these minerals. Freshly cleaved ironstone is usually...
Thuringite is a variety of the chlorite mineral chamosite, a hydrous iron and aluminium silicate mineral. It is usually found as small green scales deposited...
igneous intrusions into the Coal Measures Group of Scotland, to describe chamosite-rich mudstone of Lower Jurassic age in Great Britain, or for nephrite...
limestone. The related ironstone beds contain low grade oolitic siderite and chamosite ores which were worked commercially in the early 20th century. Remaining...
Saponite Saponite (light green) mixed with chamosite (dark green) and copper General Category Phyllosilicates Smectite group Formula (repeating unit)...
or pale brown. Greenalite occurs with quartz, stilpnomelane, siderite, chamosite, pyrite and minnesotaite. It is commonly oolitic. Greenalite, which is...
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