CAMPINORTE

Iron

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ACHONDRITE

COARSE OCTAHEDRITE

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UNGROUPED

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BRAZIL - GO

1992

Iron meteorite (ungrouped), Coarse Octahedrite

PETROGRAPHY:

(M. E. Zucolotto, MNRJ) Etched sections shows a Widmanstätten pattern with an average bandwidth of 1.3 ± 0.2 mm. The kamacite has decorated subboundaries and numerous fine 1 to 5 µm phosphides in the interior. Neumann lines are common in a few kamacite lamellae. Taenite and plessite covers 5-15% by area as comb and net plessite fields; large taenite decomposed to martensitic pattern. Schreibersite occurs as skeletal crystals or on grain boundaries. Rhabdites are common and scattered in kamacite. No large inclusions were present in the sample analyzed, although the presence of the swathing kamacite around some holes suggests the presence of inclusions removed during the cutting process.

GEOCHEMISTRY:

(J.T. Wasson, UCLA). Co = 5.8, Ni = 71 (both mg/g); Cu = 92, Ga = 74, Ge = 610, As = 12.2, Ru = 26, W = 3.05, Re = 1.9, Ir = 19.6, Pt = 33 and Au = 1.3 (all in µg/g) obtained by INAA

CLASSIFICATION:

Iron meteorite (ungrouped), coarse octahedrite (J.T. Wasson, UCLA).

CLASSIFIERS:

J. T. Wasson and M.E. Zucolotto

HISTORY:

Some miners were prospecting ores, when one of them, Mr. Laert, commented that he had found a "steel stone" some years ago. They went to the site and using a metal detector discovered the half-buried mass near a pond. Mr. Rosy suspected it to be a meteorite and asked permission of the landowner to remove part of the mass. Mr. Diniz contacted the Museu Nacional, Rio de Janeiro, where it was confirmed to be a meteorite. The farmer removed and kept the rest of the stone.

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

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