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Calderite

From Wikipedia, the free encyclopedia

Calderite
Dark red hexoctahedral crystals on light colored rock
Calderite crystals on matrix from Sunndal Norway
General
CategorySilicate mineral
Formula
(repeating unit)		(Mn2+Ca)3(Fe3+Al)2(SiO4)3
IMA symbolCdr[1]
Strunz classification9.AD.25 (10 ed)
8/A.08–40 (8 ed)
Dana classification51.4.3a.6
Crystal systemCubic
Crystal classHexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space groupIa3d
Unit cella = 11.819 Å; Z = 8
Identification
Colorbrownish red to brownish yellow
CleavageNone
Mohs scale hardness6.5–7.5
LusterVitreous
Streakwhite
Diaphaneitytransparent to translucent
Specific gravity3.756
Optical propertiesIsotropic
Refractive indexn = 1.872
References[2][3]

Calderite is a mineral in the garnet group with the chemical formula (Mn2+, Ca)3(Fe3+, Al)2(SiO4)3.

It is dark reddish brown to dark yellowish in color and generally granular massive in form.[4]

It was named for geologist James Calder who worked on the geology of India. The name was first applied to a rock in manganese deposits in Katkamsandi, Hazaribagh district, Bihar and at Netra, Balaghat district, Madhya Pradesh, India. later transferred to its predominant mineral.[3][4] In 1909 it was described as a mineral from Otjosondu, Otjozondjupa Region, Namibia.[2]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Mindat.org
  3. ^ a b Webmineral.com
  4. ^ a b Handbook of Mineralogy

Further reading

  • James Calder; J. D. Herbert (1981). Geology of the Indian Sub-continent: Observations on Mineralogy, Cypsum, Mines and Mountain Formations (reprint ed.). Cosmo Publications. p. 218.


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This page was last edited on 19 April 2024, at 16:14
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