BRAZIL - PR
Iron Meteorite - Fine Octaedrite IVA.
The sections etched with chemical attack on the polished surface exhibit a thin Widmanstatten structure with long kamacite lamellaes (~ 10-20 mm) and a width of 0.30 ± 0.05 mm. Taenite and plessite cover about 40% per area.
(J.T. Wasson, UCLA) INAA: 7.96% Ni; 0.39% Co; 1.95 ppm Ga; 2.34 ppm Ir; 1.047 ppm Au. Main phases composition (IP Ludka, IGEO-UFRJ) WDS / EPMA: kamacite (Ni = 8.3 ± 0.4; Co = 0.54; N = 20), taenite (Ni = 29.4 ± 1.4 ; Co = 0.18; N = 16), all% by weight.
This IVA type meteorite is compositionally incompatible with the other two Brazilian IVA metallic meteorites, Para de Minas and Crátheus (1931). The discovery site appears to be well documented and is far from Para de Minas and Cratheus (J. Wasson UCLA).
J. T. Wasson, M.E. Zucolotto and I. P. Ludka
The meteorite was found on a eucalyptus plantation by a teenager and his father. While the teenager was collecting stones and minerals, the meteorite caught his attention because it was very heavy. Her cousin suspected it could be a meteorite because she had watched a Brazilian TV show that discussed how to recognize meteorites.
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