Schmiederite
(repeating unit)Pb2Cu2(Se4+
O
3)(Se6+
O
4)(OH)4 IMA symbol Scm[1] Strunz classification 7.BC.65 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/m Unit cell a = 9.92 Å, b = 5.71 Å
c = 9.36 Å; β = 101.86°; Z = 2 Identification Color Pale to deep Prussian blue Crystal habit Fibrous in radial clusters; may be in crusts; powdery Luster Subadamantine to satiny Streak Light blue Diaphaneity Transparent Specific gravity 5.62 Optical properties Biaxial (+) Refractive index nα = 1.85–1.9 nβ = 1.9–1.95 nγ = 1.95–2.1 References [2][3][4] Selenites 28.1 Selenates 28.2 Tellurites 28.3 Tellurates 28.4
O
3)(Se6+
O
4)(OH)4
(same H-M symbol)
c = 9.36 Å; β = 101.86°; Z = 2
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
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Selenites, selenates, tellurites, and tellurates
Hey classification (3rd edition) 28
Ahlfeldite Chalcomenite Clinochalcomenite Cobaltomenite Demesmaekerite Derriksite Francisite Guilleminite Haynesite Mandarinoite Marthozite Molybdomenite Sofiite
Olsacherite Schmiederite
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
Carlfriesite Cheremnykhite Cuzticite Dugganite Girdite Khinite Khinite-3T Kuksite Kuranakhite Montanite Oboyerite Schieffelinite Tlalocite Tlapallite Xocomecatlite Yafsoanite Yecoraite
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