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Spherocobaltite

Cobalt carbonate mineral

Summary

Cobalt carbonate mineral

Field	Value
name	Spherocobaltite
category	Carbonate mineral
image	Sphaerocobaltite.jpg
caption	Spherocobaltite from Peramea, Lérida, Catalonia, Spain
formula	CoCO3
IMAsymbol	Scbt
molweight	118.94 g/mol
strunz	5.AB.05
system	Trigonal
class	Hexagonal scalenohedral (m)
H-M symbol: ( 2/m)
symmetry	Rc
unit cell	a = 4.65, c = 14.95 [Å]; Z = 6
color	Most commonly dark magenta red; pink to red, brown, brownish red, grey, greyish red, velvet-black (due to surface alteration)
habit	Encrustations - forms crust-like aggregates on matrix, crystals uncommon: rhombohedral to discoidal
cleavage	Perfect rhomboidal cleavage
mohs	4
luster	Vitreous
refractive	nε = 1.600, nω = 1.885
opticalprop	Uniaxial (–)
birefringence	0.285
pleochroism	Dichroic: O = violet-red; E = rose-red
streak	Pink
gravity	4.13
diaphaneity	Transparent to translucent
references

H-M symbol: ( 2/m)

Spherocobaltite or sphaerocobaltite is the mineral form of Cobalt(II) carbonate (). It is a cobalt bearing member of the calcite group of carbonate minerals, crystallizing in the trigonal crystal system. Rare specimens of pure spherocobaltite typically show a rose-red color, but the color range of impure specimens extends to shades of pink and pale brown.

Discovery and occurrence

Spherocobaltite was first described in 1877 for an occurrence within cobalt and nickel veins in the St. Daniel Mine of the Schneeberg District, Ore Mountains, Saxony, Germany. The name is from the Greek "sphaira", sphere, and cobalt, in reference to its typical crystal habit and composition. It occurs within hydrothermal cobalt-bearing mineral deposits as a rare phase associated with roselite, erythrite, annabergite and cobalt rich calcite and dolomite.

Cluster of spherocobaltite crystals from the Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (size: 11.5 x 6.0 x 4.5 cm)

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.mindat.org/min-3726.html Spherocobaltite on Mindat]
[http://webmineral.com/data/Sphaerocobaltite.shtml Spherocobaltite at Webminerals]
[http://www.handbookofmineralogy.org/pdfs/spherocobaltite.pdf Spherocobaltite in Handbook of Mineralogy]

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

carbonate-minerals cobalt-minerals symbols-of-colorado trigonal-minerals minerals-in-space-group-167 minerals-described-in-1877

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