Ferro-ferri-hornblende
(repeating unit)☐Ca2(Fe2+4Fe3+)(Si7Al)O22(OH)2 IMA symbol Ffhbl[1] Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/m Unit cell a = 9.93, b = 18.22
c = 5.32 [Å], β = 104.86° (approximated) Identification References [2][3]
(same H-M symbol)
c = 5.32 [Å], β = 104.86° (approximated)
Ferro-ferri-hornblende is an amphibole-supergroup mineral with the formula ☐Ca2(Fe2+4Fe3+)(Si7Al)O22(OH)2. It contains essential vacancy (☐). It was discovered in the Traversella mine, Canavese, Torino, Piedmont, Italy.[2]
References
- ^ 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.
- ^ a b Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Pagano, R., and Pagano, A., 2015. Ferro-ferri-hornblende, IMA 2015-054. CNMNC Newsletter No. 27, October 2015, 1227; Mineralogical Magazine 79, 1229–1236
- ^ "Ferro-ferri-hornblende: Ferro-ferri-hornblende mineral information and data". Mindat.org. Retrieved 2016-03-13.
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