|Nossa Senhora do Livramento|
|Basic information||Name: Nossa Senhora do Livramento|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2016
Mass: 1120 g
This is 1 of 302 approved meteorites classified as Iron, IIIAB. [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
|Comments:||Approved 8 Mar 2017|
Writeup from MB 106:
Nossa Senhora do Livramento 15°59’S, 56°18’W
Mato Grosso, Brazil
Find: 2016 Aug
Classification: Iron meteorite (IIIAB)
History: Found by a prospector, Valmir P. Scarabeli, while he was searching for gold with a metal detector. The finder sent samples to Andre Moutinho who performed preliminary tests that confirmed the sample’s meteoritic origin. Samples were then provided to Dr. Zucolotto for a complete analysis and classification.
Physical characteristics: A weathered mass weighing 1120 g and measuring about 110 × 80 × 30 mm. The examined section was highly corroded with a thick oxide crust, the corrosion penetrating deeply to the very center of the meteorite, particularly along grain boundaries.
Petrography: (M.E. Zucolotto, MNRJ/UFRJ) The meteorite is a medium octahedrite containing kamacite, taenite and few plessite fields. Kamacite bandwidth is 0.90±0.15 mm. Kamacite shows Neumann bands with microhardness of HV 205±15. Plessite fields include degenerated comb and net plessite with dark taenite wedges. Also present in some grains are decorated Neumann bands and numerous micrometer-sized gamma precipitates on the kamacite. A small troilite-daubreelite (0.5 × 1.0 mm) nodule was observed with iron sulfide eutectic and small subangular daubreelite grains.
Geochemistry: (J.T. Wasson, UCLA): INAA data, Ni = 74.6, Co = 5.00 (both mg/g), Cr=58, Cu = 204, Ga = 20.7, As = 4.86, W=1.34, Re=1481, Ir =12.8, Pt=18.1 Au = 0.654 (all μg/g). (A. Tosi, IGEO/UFRJ): kamacite 7.24 % Ni, 0.48 % Co, taenite and tetrataenite.
Classification: Iron, IIIAB. The meteorite plots in the IIIAB field and differs in composition from all Brazilian Irons.
Specimens: Main mass with Rodrigo Guerra, 70 g MNRJ, 90 g Andre Luiz R Moutinho, 62 g Carlos Augusto Di Pietro.
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)
|References:||Published in Meteoritical Bulletin, no. 106, in preparation (2017)|
This is 1 of 2 approved meteorites from Mato Grosso, Brazil (plus 1 impact crater)
This is 1 of 71 approved meteorites from Brazil (plus 6 unapproved names) (plus 6 impact craters)
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