Cronstedtite - Named for Axel Fredrik Cronstedt, Swedish mineralogist and chemist. Hardness: 3.5; WebMineral: View Cronstedtite; Mindat: View Cronstedtite 

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. Mindat: Cronstedtite. Minerals:

This and many more mineral specimens are available for sale at Dakota Matrix Minerals. 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. . This and many more mineral specimens are available for sale at Dakota Matrix Minerals. Cronstedtite - The face of this specimen is covered with jet black, highly lustrous, tiny (less than 0.5mm) Cronstedtite crystals associated with tiny discoidal Siderite crystals with inclusions of possible Boulangerite.

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Mindat.org is an outreach project of the Hudson Institute Ask about Cronstedtite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español. Print or Cut-and-Paste your Cronstedtite Specimen Label here : Name: Named by Josef Johann Steinmann in 1821 in honor of Axel Fredrik Cronstedt (1722-1765), Swedish chemist and mineralogist who discovered nickel, scheelite and coined the term zeolite. Cronstedt's mineralogical books revolutionized mineralogy and he is sometimes regarded as the father of modern mineralogy. Cronstedtite is a major constituent of CM chondrites, a carbonaceous chondrite group exhibiting varying degrees of aqueous alteration. Cronstedtite abundance decreases with increasing alteration. 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 71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3 1 m 3m : Strunz Class: 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 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 is a major constituent of CM chondrites, a carbonaceous chondrite group exhibiting varying degrees of aqueous alteration.

Mindat locality: Salsigne mine, Salsigne, Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. Its chemical formula is Fe 2+ 2 Fe 3+ (Si,Fe 3+ O 5)(OH) 4. It was discovered in 1821 and named in honor of Swedish mineralogist Axel Fredrik Cronstedt (1722–1765).

Mindat ProductsOpen discussion area. I recieved two fine specimens of cronstedtite and I am thinking, that they came from Salsigne. Thanks for help Pavel.

It has been found in Bohemia in the Czech Republic and in Cornwall, England. Photo added to mindat.org “ Group of black prismatic crystals of cronstedtite with pyrite and minor siderite crystals. Field of view is 4 mm.

Mindat - search for: Cronstedtite-3T Webmineral - search for:Cronstedtite-3T Handbook-of-Mineralogy - search for: Cronstedtite-3T RRUFF - Raman, XRD and other mineral data - search for: Cronstedtite-3T RRUFF - References and PDF downloads - search for: Cronstedtite-3T American-Mineralogist-Crystal-Structure-Database - search for: Cronstedtite

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The sample at left is about 12 cm across and is from Herja, Crisana-Maramures, Romania. This sample is described as cronstedtite with siderite.

Photo added to mindat.org “ black crystals of Cronstedtite dimension area mm. 4 x 4 photo Germano Fretti collection Luigi Chiappino ” Luigi Chiappino - 26th September Photo added to mindat.org “ group of elongated prismatic crystals of cronstedtite area size 5.0 mm Photo Enrico Bonacina (OLYMPUS DIGITAL CAMERA) Collection Domenico Preite ” Domenico Preite - … Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. Its chemical formula is Fe 2+ 2 Fe 3+ (Si,Fe 3+ O 5)(OH) 4. It was discovered in 1821 and named in honor of Swedish mineralogist Axel Fredrik Cronstedt (1722–1765).
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The Mineral Evolution Database (http://rruff.info/ima/), in association with mindat ( https://www.mindat.org), combines spatial (locality) with temporal (age) data for 

Cronstedtite is a rare iron silicate of the serpentine group. 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.

71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3 1 m 3m : Strunz Class: 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas

Its chemical formula is Fe 2+ 2 Fe 3+ (Si,Fe 3+ O 5)(OH) 4. It was discovered in 1821 and named in honor of Swedish mineralogist Axel Fredrik Cronstedt (1722–1765). It has been found in Bohemia in the Czech Republic and in Cornwall, England.

Field of view is 4 mm. Confirmed by SXRD as cronstedtite-3T (subfamily A). Cronstedtite Specimen ID: UHE-DL7. Mineral(s) Cronstedtite: Fe 2+ 2 Fe 3+ ((Si,Fe 3+) 2 O 5)(OH) 4.