Cronstedtite (Fe 2+ , Fe 3+ ) 3 (Si, Fe 3+ ) 2 O 5 (OH) 4; Fraipontite (Zn, Al) 3 (Si, Find location list for serpentines in the Mineralienatlas and Mindat ( accessed

Superb coverage of trigonal Cronstedtite crystals, an rare Iron Silicate. The well formed crystals measure to 3mm in size, and encrust the matrix to a depth of 5mm. The crystals are black with a sub-metallic to vitreous lustre. It is a rare occurrence to have such a rich coverage of Cronstedtite, and this specimen displays very well.

This and many more mineral specimens are available for sale at Dakota Matrix Minerals. This sample of cronstedtite is displayed in the Smithsonian Museum of Natural History. 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.

Cronstedtite mindat

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.

mindat.org (Ralph and Chau, 2012) and webmineral.com. (Barthelmy Amesite, Antigorite, Berthierine, Brindleyite, Caryopilite, Chrysotile, Cronstedtite,.

Cronstedtite: Hybler J (2006) Parallel intergrowths in cronstedtite-1T: determination of the degree of disorder European Journal of Mineralogy 18 197-205: 2006: Roznava, Slovakia: 0: 293: 0007148: Cronstedtite: Hybler J (2006) Parallel intergrowths in cronstedtite-1T: determination of the degree of disorder European Journal of Mineralogy 18 197

Cronstedtite - Named for Axel Fredrik Cronstedt, Swedish mineralogist and chemist. Hardness: 3.5; WebMineral: View Cronstedtite; Mindat: View Cronstedtite The sample at left is about 12 cm across and is from Herja, Crisana-Maramures, Romania.

Hendricks S B , American Mineralogist , 24 (1939) p.529-539, Random structures of layer minerals as illustrated by cronstedtite, (2FeO.Fe2O3.SiO2.2H2O). Possible iron content of kaolin View Additional jPOWD Structure files for Cronstedtite

mindat.org – The Mineral Database. Utilisation. Notes et références.

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English: Cronstedtite Locality: Herja Mine (Kisbánya), Baia Mare (Nagybánya), Maramures County, Romania (Locality at mindat.org) A rich crust covered with sharp, lustrous , fat crystals to 2-3 mm in size, makes this a very fine miniature of this classic rarity (a complex iron silicate with multiple oxidation states of iron in the same crystal). Cronstedtite - Named for Axel Fredrik Cronstedt, Swedish mineralogist and chemist. Hardness: 3.5; WebMineral: View Cronstedtite; Mindat: View Cronstedtite The sample at left is about 12 cm across and is from Herja, Crisana-Maramures, Romania. This sample is described as cronstedtite with siderite.
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Photo added to mindat.org “ Group of black prismatic crystals of cronstedtite with pyrite and minor siderite crystals. Field of view is 4 mm. Confirmed by SXRD as cronstedtite-3T (subfamily A).

3rd Jan 2010 21:23 UTC Rob Woodside Cronstedtite Specimen ID: UHE-DL7. Mineral(s) Cronstedtite: Fe 2+ 2 Fe 3+ ((Si,Fe 3+) 2 O 5)(OH) 4. Locality.

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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

215-780-7736. Euru | 504-319 Phone Numbers | Kenner, Louisiana Minda Herbig. 215-780-5203.