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Unit weight: 399.492988 u; Number of atoms in the formula: 18. Info. 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 … Cronstedtite Fe2+ 2 Fe 3+(SiFe3+)O5(OH)4 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Triclinic, monoclinic, or hexagonal. Point Group: See polytypes. As hexagonal prisms, tapering toward one end and vertically striated. In divergent ¯brous groups; cylindroidal, reniform, massive.

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

Name Origin: Named for Axel Fredrik REFERENCES for Cronstedtite; American Mineralogist Crystal Structure Database Record: [view record] Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America.

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: a mineral consisting of a black hydrous iron silicate of the chlorite group, crystallizing in hexagonal prisms with perfect basal cleavage, and showing a dark green streak (specific gravity 3.34–3.35) Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. It has a formula of Fe 22+ Fe 3+ ( (Si,Fe 3+) 2 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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Cronstedtite - Brilliant, lustrous trigonal crystals of in prisms and discoidal crystals. . 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.

LAYER SILICATES BY ELECTRON DIFFRACTION AND . 3. APPLICATION TO CRONSTEDTITE MINERAL . 4. SYNTHETIZED FROM IRON-CLAY INTERA 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 Google Arts & Culture features content from over 2000 leading museums and archives who have partnered with the Google Cultural Institute to bring the world's treasures online.
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Dwarf planet Ceres is the largest body in the main asteroid belt with a rocky surface and uncertain internal structure. Spectra of Ceres in near- and mid-infrared wavelengths are consistent with the occurrence of brucite, Mg-bearing carbonates, and an Fe-rich phyllosilicate cronstedtite.
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Additional information / Summary. Polytypen 1T, 1M, 2H 1, 2H 2, 2M 1, 2T, 3T, 6R 2, 6T 2 bekannt.

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POLYTYPES IDENTIFICATION IN TRIOCTAHEDRAL 1:1 . 2. LAYER SILICATES BY ELECTRON DIFFRACTION AND . 3.

Silicon 7.03 % Si 15.04 % SiO 2 A low-temperature hydrothermal product in ore veins. Cronstedtite Image.