ARRAIAS

Iron

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ACHONDRITE

HEXAEDRITE

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IIAB

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BRAZIL - TO

2015

Iron Meteorite - IIAB Hexaedrite

PETROGRAPHY:

The section etched after the acid attack on the polished surface shows a typical hexahedrite structure with shiny areas of kamacite and several sets of Neumann lines crossing the entire surface. There is no sign of fusion crust and heat-affected zone. Troilites are present as small nodules. Phosphides occur as numerous crystals of rabdite both prisms and planar morfology.

GEOCHEMISTRY:

5.42% Ni; 0.45% Co; 57.4 ppm Ga; <200ppm Ge; 30.8 ppm Ir; 0.512 ppm Au (INAA, J.T. Wasson, UCLA). Kamacite 5.34% Ni; 0.41% Co. Phosphides 27% Ni; 14.7% P (EPMA Amanda Tosi LABSONDA / IGEO / UFRJ).

CLASSIFICATION:

Iron meteorite, IIAB Hexahedrite

CLASSIFIERS:

J. T. Wasson, M.E. Zucolotto and A. A. Tosi

HISTORY:

Discovered in April 2015 near the city of Arraias, in the region of Mata da Ursa, by a gold miner named Vicente in an excavation of gold tailings. He alerted his boss about the discovery, Mr. José Domingos Scarpellini, who later took the meteorite to Curitiba.

All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.

All images are copyrighted.