Bulletin - United States National Museum - Smithsonian

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• Step IV: Cronstedtite became the dominant alteration mineral. Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. It has a formula of Fe2+2Fe3+(Si,Fe3+O5)(OH)4. It was discovered  14 Dec 2020 We report the textures, mineralogy and mineral chemistry of the Mukundpura The non-stoichiometric, Tochilinite-Cronstedtite occurrences  Fe3(SiFe)O5(OH)4. This sample of cronstedtite is displayed in the Smithsonian Museum of Natural History.

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Calculated diffraction file. Output file from the Bruker D8 Cronstedtite Category: Silicate minerals Formula: Fe 2+2 Fe 3+ (Si, Fe 3+ O 5 ) (OH) 4 Crystal system: Trigonal Crystal class: Ditrigonal pyramidal (3m) (same H-M symbol) 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 (4 more images) ON HOLD. A Modern Mineral Connoisseur. The Miguel Romero Collection of Mexican Minerals. Rare Chalcopyrite Balls from Daye, China. Tourmaline: Oct 8, 2015 - Nagybörzsöny, Szob, Börzsöny Mountains, Pest County, Hungary - Collection: Gábor Koller. Kisbanya, Baia Mare, Romania 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.

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.

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Point Group: See polytypes. As hexagonal prisms, tapering toward one end and vertically striated. In divergent ¯brous groups; cylindroidal, reniform, massive. Twinning: Twin axis [001]; interpenetrating trigonal pyramids Variety of the chlorite mineral chamosite, a hydrous iron and aluminium silicate mineral.

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3. APPLICATION TO CRONSTEDTITE MINERAL . 4. … The objective of this paper is to describe the new serpentine group mineral, guidottiite, which is analogous to cronstedtite. Guidottiite has an ideal chemical composition of (Mn2Fe3+)(SiFe3+)O5(OH)4. The sample is from the N’chwaning 2 mine, Kalahari manganese field, Republic of South Africa, and apparently forms from hydrothermal solutions. Grains are optically near opaque [average index Cronstedtite: Hendricks S B: American Mineralogist 24 (1939) 529-539: Random structures of layer minerals as illustrated by cronstedtite (2FeO.Fe2O3.SiO2.2H2O).

Cronstedtite Pisani.jpg 3,564 × 3,648; 9.14 MB. Cronstedtite-112560.jpg 600 × 531; 79 KB. Cronstedtite-219106.jpg 750 × 547; 121 KB. Cronstedtite-219107.jpg 400 × 321; 56 KB. Cronstedtite-270285.jpg 600 × 416; 57 KB. Cronstedtite-270286.jpg 400 × 347; 52 KB. Cronstedtite-mrz147a.jpg 600 × 531; 75 KB. Cronstedtite is an uncommon hydrous silicate that has a most unusual growth habit.
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Collected on the 9th level of the San Antonio mine in 2017.

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Minerals appearing in clays generally have layer lattice structures formed f is limited to (class 2) kaolin minerals, serpentines, and cronstedtite; (class 3) pyro-.

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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. 1 1. POLYTYPES IDENTIFICATION IN TRIOCTAHEDRAL 1:1 . 2.

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