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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.

This and many more mineral specimens are available for sale at Dakota Matrix Minerals. Cronstedtite on matrix. Mineral Data. What's on the rock. Cronstedtite. Formula: Fe 2+ 2 Fe 3+ ((Si,Fe 3+) 2 O 5)(OH) 4. Strunz: 9.ED.15.

Cronstedtite mineral

Possible iron content of kaolin American Mineralogist 24 529-539: 1939: 0: 293: 0007145: Cronstedtite: Hybler J (2006) Parallel intergrowths in cronstedtite-1T: determination of the degree of disorder European Journal of Mineralogy 18 Cronstedtite is an uncommon mineral that occurs as a hydrothermal product in ore veins in localities in the Czech Republic, Romanis, Germany, France, England, the United States, Mexico, Brazil, and Bolivia, among other minor localities. Assocaited minerals include siderite, pyrite, sphalerite, clinochlore, and quartz. Cronstedtite Individual member mineral of the Serpentine group with a chemical formula of Fe2+2Fe3+(SiFe3+)O5(OH)4. 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.

It shows to advantage the triangular pincoid terminations of the Cronstedtite crystals, which form an intergrown covering of rounded clusters with lustrous black colour.

Two samples of cronstedtite, a mixed valence serpentine with ideal formula {Fe 2 2+ ,Fe3+}[Si,Fe3+]O5(OH)4, have been examined by X-ray and neutron diffraction, thermopiezic analysis, magnetization and susceptibility measurements and Mössbauer spectroscopy. The conductivity is thermally activated, with activation energies of 0.25 eV in the basal plane and 0.37 eV in the perpendicular

Cronstedtite. Formula: Fe 2+ 2 Fe 3+ ((Si,Fe 3+) 2 O 5)(OH) 4. Strunz: 9.ED.15. Crystal System: The present study provides an example of the accurate identification of polytypes of trioctahedral 1:1 layered silicates from single-crystal X-ray diffraction data collected with the aid of a four-circle diffractometer equipped with an area detector.

Stenar Och Mineraler, Kristaller Mineraler, Ädelstenar, Cool Stuff, Fossiler Cronstedtite | #Geology #GeologyPage #Mineral Locality: Nagyborzsony, Borzsony

PY - 2014/1/1. Y1 - 2014/1/1. N2 - Dwarf planet Ceres is the largest body in the main asteroid belt with a rocky surface and uncertain internal structure. Chlorite is commonly found in igneous rocks as an alteration product of mafic minerals such as pyroxene, amphibole, and biotite.In this environment chlorite may be a retrograde metamorphic alteration mineral of existing ferromagnesian minerals, or it may be present as a metasomatism product via addition of Fe, Mg, or other compounds into the rock mass. Cronstedtite: Hendricks S B: American Mineralogist 24 (1939) 529-539: Random structures of layer minerals as illustrated by cronstedtite (2FeO.Fe2O3.SiO2.2H2O). Minerals Exclusions . Locality .

Additional information / Summary.
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Cronstedtite is not a common mineral but it is not extremely rare and Mindat lists 37 localities (2010).

Cronstedtite Mineral Data General Cronstedtite Information.
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Cronstedtite, a complex iron silicate, is one of the classic minerals forever associated with Wheal Jane at Baldhu, between Redruth and the city of Truro in Cornwall. The Cronstedtite forms triangular crystals, 1 to 2 mm across, jet-black with a bright reflective lustre, richly covering a 5 x 1.5 cm surface of grey Killas matrix.

This and many more mineral specimens are available for sale at Dakota Matrix Minerals. Cronstedtite - Brilliant, lustrous trigonal crystals of in prisms and discoidal crystals. .

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the properties of the clay, e.g. affect its sealing properties by mineral alteration. cronstedtite) at lower temperatures and chlorites (e.g. chamosite) at higher

Cronstedtite Personeriasm. 317-401-6590 317-401-9845. Sprayfoamroofinsulation | 330-859 Phone Numbers | Mineral Cy, Ohio. 317-401- Cronstedtite, etc. San Antonio Mine, East Camp, Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico · 08571490014946633116123.

Cronstedtite-2H2 mineral data, information about Cronstedtite-2H2, its properties and worldwide locations.

SOREG15-149 Cronstedtite on Siderite (rare locale) Request Information Miniature, 5.2 x 4.1 x 2.2 cm Huanzala Mine, Dos de Mayo Province, Huanuco Department, Peru Cronstedtite - Brilliant, lustrous trigonal crystals of in prisms and discoidal crystals.

It was recognized as a species since about 1890. By far the best locality for specimens appears to be the Herja mine in Romania.