Scandinavia - Mindat.org

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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). It has been found in Bohemia in the Czech Republic and in Cornwall, England.

Cronstedtite mindat

[Fe2+ Mindat.org, Huanuni, Dalence Province, Oruro, Bolivia. in our collection. Find details about any mineral at https://www.mindat.org/. 21499, pending, Cronstedtite, kaolinite-serpentine group, England, Cornwall.

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Specimen size: 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. By far the best locality for specimens appears to be the Herja mine in Romania.

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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. This very rich and showy little specimen is festooned with lustrous, black, trigonal crystals to 3 mm on a 3-dimensional crust of matrix.

Cronstedtite-3T mineral data, information about Cronstedtite-3T, its properties and worldwide locations. 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.
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Liens externes. (en) « Manandonite », sur Mindat.org (consulté le 23 décembre 2018). Portail des minéraux et roches.

Black CrystalsCzech 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 (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 corundum, cosalite, covellite, crandallite, cristobalite, crocoite, cronstedtite, Ralph J. & Ralph I., 1993-2009: Mindat.org. http://www.mindat.org/min-872.html. mindat.org (Ralph and Chau, 2012) and webmineral.com. (Barthelmy Amesite, Antigorite, Berthierine, Brindleyite, Caryopilite, Chrysotile, Cronstedtite,.
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Excellent old specimen. Sawed backside.

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Link to MinDat.org Location Data. Name Origin: Named for Axel Fredrik Cronstedt (1722-1765), Swedish mineralogist and chemist. Name Pronunciation: Cronstedtite + Pronunciation. Cronstedtite-2H2 mineral data, information about Cronstedtite-2H2, its properties and worldwide locations.

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Type Locality. . 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. .

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.