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Cronstedtite is a silicate mineral with the composition Fe 3 (SiFe)O 5 (OH) 4. The sample at left is about 12 cm across and is from Herja, Crisana-Maramures, Romania. This sample is described as cronstedtite with siderite. Mindat: Cronstedtite. Minerals: Cronstedtite - Brilliant, lustrous trigonal crystals of in prisms and discoidal crystals. .
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Reactor Personeriasm · 780-474-4125 Minda Pixler. 780-474-6707. Eyesight Personeriasm · 780-474-8726 Cronstedtite Personeriasm. 215-780-7736.
Excellent old specimen.
Scandinavia - Mindat.org
Mineralogical Society of Great Britain and Ireland, London. mindat.org – The Mineral Database.
Scandinavia - Mindat.org
It was recognized as a species since about 1890. By far the best locality for specimens appears to be the Herja mine in Romania. 3.5 x 2.3 x 1.8 cm. Cronstedtite is a rare iron silicate of the serpentine group.
(en) « Greenalite », sur Mindat; (en) « Greenalite », sur Webmin. Cronstedtite - American Mineralogist 24 (1939), 529-539. Publication autors: Hendricks S B, Random structures of layer minerals as illustrated by cronstedtite (2FeO.Fe2O3.SiO2.2H2O).
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71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3 1 m 3m : Strunz Class: 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas Cronstedtite - Black micro crystals in a 2mm group. Confirmed. .
Mindat locality: Salsigne mine, Salsigne, Carcassonne, Aude, Occitanie, France × Previous Next Photos. Events. Photo added to mindat.org “ Groupe crystals black
Mindat 手册 Group of black crystals of cronstedtite-3T resting on siderite crystals.
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Cronstedtite-1M Cronstedtite-1T Cronstedtite-2H2 Cronstedtite-3T : Monoclinic : Trigonal : Hexagonal : m - Domatic: 3m - Ditrigonal Pyramidal: 6 - Pyramidal : Bm: P3 1m: P6 3 : Cm: P3 1m: P6 3 : a = 5.5033(3) Å, b = 9.5289(6) Å, c = 7.3328(5) Å β = 104.493(7)° a = 5.512(1) Å, c = 7.106(1) Å: a = 5.500(1) Å, c = 14.163(2) Å: a:b:c = 0.578 : 1 : 0.77: a:c = 1 : 1.289 Cronstedtite is not a common mineral but it is not extremely rare and Mindat lists 37 localities (2010). It was recognized as a species since about 1890.