|Basic information||Name: Campinorte|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1992
Mass: 2 t
This is 1 of 120 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
|Comments:||Approved 25 Aug 2010|
Writeup from MB 99:
Campinorte 14°15.48’S, 49°9.55’W
Classification: Iron meteorite (ungrouped)
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.
Physical characteristics: A large pear shaped mass of about 2 tons with no fusion crust or regmaglypts.
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).
Specimens: A total sample mass of 26.2 g is on deposit in MNRJ, and 70.0 g on deposit at UAb, including a 49.2 g slice. The main mass is in Campinorte with an anonymous owner.
MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011)
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
|References:||Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]|
This is 1 of 7 approved meteorites from Goias, Brazil
This is 1 of 71 approved meteorites from Brazil (plus 6 unapproved names) (plus 6 impact craters)
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