Ziesite
(repeating unit)β-Cu2V2O7 IMA symbol Zie[1] Strunz classification 8.FA.10 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group A2/a Unit cell a = 7.68 Å, b = 8 Å
c = 10.09 Å; β = 110.27°; Z = 2 Identification Color Black; reddish brown to dark reddish brown in transmitted light; white in reflected light Crystal habit Anhedral crystals and incrustations Cleavage None Luster Metallic Streak Red brown Diaphaneity Opaque Specific gravity 3.86 Optical properties Biaxial Refractive index 2.055 References [2][3][4]
(same H-M symbol)
c = 10.09 Å; β = 110.27°; Z = 2
Ziesite is a copper vanadate mineral with formula: β-Cu2V2O7. It was discovered in 1980 as monoclinic crystals occurring as volcanic sublimates around fumaroles in the crater of the Izalco Volcano, El Salvador. It is named after Emanuel George Zies (1883–1981), an American geochemist who studied Izalco in the 1930s.
Closely related is blossite, also a copper vanadate with formula of α-Cu2V2O7. It forms orthorhombic crystals. Blossite was also first described for specimens from the Izalco volcano.
Ziesite and blossite are polymorphs, different crystal structure for the same chemical composition and are quite similar in physical properties.
Associated minerals include stoiberite, shcherbinaite, bannermanite, fingerite, mcbirneyite, blossite, chalcocyanite and chalcanthite.[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 Ziesite in The Handbook of Mineralogy
- ^ Ziesite on Mindat.org
- ^ Ziesite data on Webmineral
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