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Charcas meteorite, Charcas, Mun. de Charcas, San Luis Potosí, Mexico

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Latitude & Longitude (WGS84): 23° 5' North , 101° 1' West
Latitude & Longitude (decimal): 23.0833333333, -101.016666667
Iron meteorite, Octahedrite (IIIAB, Om)
Find, 1804; 1.4 tons

A large (780 kg) prismatic, but corroded and pitted mass was initially reported at the corner of a churchyard, but had apparently been transported from its original site. Several other masses from the same fall have been found in the region including the large Descubridora fragment (~500 kg) initially reported as a separate discovery. The meteorite features prominent Widmanstätten structure with long kamacite lamellae while plessitic regions constitute perhaps 40 vol% of the meteorite. The kamacite has been altered by preterrestrial shock and, in some fragments, by selective artificial heating. Schreibersite occurs mostly as boundary precipitates while troilite is common as nodules. Very minor amounts of chromite and daubréelite are also reported. Various iron oxides are present in hardened veins.

Charcas is the ninth most massive of the eleven IIIAB iron meteorites with a mass of one ton or more.

Curation: Main masses of the Charcas meteorite, the Descubridora fragment, and the Catorce fragment are at the Museum National d'Histoire Naturelle (Paris), National Museum (Mexico City) and Naturhistorisches Museum (Wiens/Vienna), respectively.

Mineral List

10 entries listed. 7 valid minerals.

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Fletcher, L. (1890) On the Mexican Meteorites, with especial regard to the occurrence of wide-spread meteoritic showers. Mineralogical Magazine 9 (42):91-180. [Cf., esp. 160-162] (Aug 1890)

Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.

Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.

Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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