Schmiederite

(repeating unit)Pb2Cu2(Se4+
O
3)(Se6+
O
4)(OH)4IMA symbolScm[1]Strunz classification7.BC.65Crystal systemMonoclinicCrystal classPrismatic (2/m)
(same H-M symbol)Space groupP21/mUnit cella = 9.92 Å, b = 5.71 Å
c = 9.36 Å; β = 101.86°; Z = 2IdentificationColorPale to deep Prussian blueCrystal habitFibrous in radial clusters; may be in crusts; powderyLusterSubadamantine to satinyStreakLight blueDiaphaneityTransparentSpecific gravity5.62Optical propertiesBiaxial (+)Refractive indexnα = 1.85–1.9 nβ = 1.9–1.95 nγ = 1.95–2.1References[2][3][4]

Schmiederite is a secondary mineral in the oxidized zone of selenium-bearing hydrothermal base metal deposits. Its chemical formula is Pb2Cu2(Se4+O3)(Se6+O4)(OH)4.[3][4]

It was first described in 1962 for an occurrence in the Cóndor mine, Los Llantenes district, Sierra de Cacheuta, La Rioja Province, Argentina (type locality). It was named for Oscar Schmieder (1891–1980), German geographer.[3]

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. ^ Schmiederite on Webmineral
  3. ^ a b c Schmiederite on Mindat.org
  4. ^ a b Handbook of Mineralogy
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Selenites, selenates, tellurites, and tellurates
Hey classification (3rd edition) 28
Selenites 28.1
Ahlfeldite Chalcomenite Clinochalcomenite Cobaltomenite Demesmaekerite Derriksite Francisite Guilleminite Haynesite Mandarinoite Marthozite Molybdomenite Sofiite
Selenates 28.2
Olsacherite Schmiederite
Tellurites 28.3
Balyakinite Blakeite Cesbronite Chekhovichite Choloalite Cliffordite Denningite Emmonsite Eztlite Fairbankite Graemite Keystoneite Kinichilite Mackayite Moctezumite Mroseite Plumbotellurite Poughite Quetzalcoatlite Rajite Rodalquilarite Schmitterite Smirnite Sonoraite Spiroffite Teineite Winstanleyite Zemannite
Tellurates 28.4
Carlfriesite Cheremnykhite Cuzticite Dugganite Girdite Khinite Khinite-3T Kuksite Kuranakhite Montanite Oboyerite Schieffelinite Tlalocite Tlapallite Xocomecatlite Yafsoanite Yecoraite


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