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Bulletin - United States National Museum - Smithsonian

Excellent radial botryoidal black Cronstedtite displays a multitude of sparkling terminated crystal faces over an area measuring to 4.8cm x 4.5cm on a creamy hard clay mineral. T1 - Formation of brucite and cronstedtite-bearing mineral assemblages on Ceres. AU - Zolotov, Mikhail. 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 mineral

Mineral Data. What's on the rock. Cronstedtite. Formula: Fe 2+ 2 Fe 3+ ((Si,Fe 3+) 2 O 5)(OH) 4.

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

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Table 3 Minerals and their standard Gibbs free energies of formation, D fG 0 (25 C, 1 bar). Mineral Formula Abbreviation D fG Mar 20, 2018 - Chemical Formula: Fe22+Fe3+((Si,Fe3+)2O5)(OH)4 Locality: Pribram and Kuttenberg, Bohemia of Czechoslovakia. 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. 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.

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It shows to advantage the triangular pincoid terminations of the Cronstedtite crystals, which form an intergrown covering of rounded clusters with lustrous black colour. Although cronstedtite could form on planetesimals, the apparent lack of serpentine may indicate its formation by Ceres’ temporary surface solutions. Brucite forms at a low activity of dissolved SiO 2, at a low fugacity of CO 2, and at highly alkaline pH. Brucite and cronstedtite do not form together and may not form deep in the Ceres’ interior.

Cronstedtite Mineral Data General Cronstedtite Information. Silicon 7.03 % Si 15.04 % SiO 2 A low-temperature hydrothermal product in ore veins. Cronstedtite Image. Comments: Pyramidal crystals of cronstedtite. Location: Santa Eulalia, Chihuahua, Mexico. Scale: Not Cronstedtite Crystallography. 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.
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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 .

Спешите купить журнал на официальном сайте DeAgostini и соберите всю Secondary minerals from old mines in Baia Mare mining area, Maramures, such as stibnite, berthierite, tetrahedrite, cronstedtite, vivianite, wolframite etc. 26 Sep 2012 We also unambiguously identified cronstedtite, a phyllosilicate from the serpentine mineral family.
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Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.