Nova Olinda        7°28’S, 38° 1’W

Paraiba, Brazil

Find: 2014 Nov

Classification: Iron meteorite (IIAB)

History: (Andre L. R. Moutinho) The meteorite was found by brothers Edsom Oliveira da Silva and João Jarba Oliveira da Silva in November 2014, while prospecting for gold with a metal detector in the dry lake region of a farm in the rural area of Nova Olinda, Paraíba. Mr Edsom sent samples to Andre L R Moutinho that confirmed the sample as a meteorite.

Physical characteristics: Elongated shape, 26 kg, 29 × 15 × 1 7cm

Petrography: (Andre L. R. Moutinho) The meteorite has suffered intense weathering and no fusion crust or layer 2 region were observed. Terrestrial corrosion products were found up to 1-3 cm deep into the meteorite. In some portions, weathering followed the cubic cleavage planes of the original kamacite lamella. Two polished etched slices measuring 50 × 37 and 37 × 28 mm were studied. The etched slices shows thick lamellae of kamacite typically found in coarsest octahedrites. The average kamacite bandwidth is 5.93±2.4 mm (n=5). Neumman bands are abundant and were observed in some kamacite lamellae. Sparse plessite fields develops as comb plessite sometimes associated with wedge-shaped black taenite fields. Schreibersite wide ribbons and in crystals are abundant.

Geochemistry: ICP-MS data, using a sample of North Chile (Filomena) as standard (C. Herd and P. Hill, UAb); ICP-MS method: Cr = 1.29, Ir = 0.01, Ga = 42.8, Ge = 105, As = 12.6, Pt = 1.37, Cu = 94.2, W = 0.09, Pd = 1.41, Ag = 0.012, (all ug/g). (M. S. Navarro and J. Enzweller, DGRN/Unicamp) LA-ICP-MS data: Ni = 62.18, Co = 5.33 (both mg/g); Cr = 16.8, Ir = 0.02, Ga = 51.9, Ge = 95, As = 13.7, Pt = 1.02, Cu = 120, Au = 1.13, W = 0.47, Pd = 2.27, Ag = 0.22, (all ug/g). (R. Scholz and G. N. Queiroga, DEGEO/EM/UFOP, D. Atencio, IGc/USP). EPMA: kamacite: 0.55% Co. Schreibersite (Fe = 67.74±0.28 wt.%, Ni = 15.79±0.02 wt.%, P = 13.58±0.05 wt.%, n = 7).

Classification: Iron, IIAB The meteorite plots in IIAB fields and differs in composition from all Brazilian Irons. Type is consistent with the analysed structure.

Specimens: Main mass with finder, 49 g at Unicamp, 66 g at USP, 33.6g at UAb, 2 kg with Andre L R Moutinho,