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Epidote group

From Wikipedia, the free encyclopedia
Epidote group
General
CategorySorosilicates
Formula
(repeating unit)
(A2+1A2+2)(M3+1M3+2M3+3)O[Si2O7][SiO4](OH)
IMA symbolEp
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H–M symbol)
Space groupP21/m
Identification
ColorYellow-green, pistachio green, greenish black, brownish-green, green, black
Crystal habitPrismatic, fibrous, druse/encrustation, massive
TwinningOn [100]
Cleavage{001} perfect and {100} imperfect
Mohs scale hardness6–7
LusterVitreous

Epidotes are a group of sorosilicate minerals that are common in igneous and metamorphic rocks.[1][2][3]

Epidote member species

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References

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  1. ^ Armbruster, T.; Bonazzi, P.; Akasaka, M.; Bermanec, V.; Chopin, C.; Gieré, R.; Heuss-Assbichler, S.; Liebscher, A.; Menchetti, S.; Pan, Y.; Pasero, M. (2006). "Recommended nomenclature of epidote-group minerals". European Journal of Mineralogy. 18 (5): 551−567. Bibcode:2006EJMin..18..551A. doi:10.1127/0935-1221/2006/0018-0551.
  2. ^ Kartashov, P. M. (2014). "Classification diagram for REE-bearing members of the epidote group based on crystallochemical data". Proceedings of the Workshop on Acessory Minerals: 25−26.
  3. ^ 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.