NWA 1982
Ungrouped achondrite related to Brachinite

A 368 g partially crusted stone was purchased in Rissani, Morocco in 2001. Classification and mineralogy (T. Bunch and J. Wittke, NAU): cataclastic pyroxenite with randomly dispersed metal grains; partial recrystallization of matrix and along fractures of large (up to 5 mm) orthopyroxene grains. Mineral modes: orthopyroxene, 68 vol.%; metal, 12%; plagioclase. 8%; troilite, 3%; ilmenite, 3%; phosphate, 2% spinels, 2%, and augite, 2%. Opx = Fs28Wo3; plagioclase = An90; spinel #1, Al2O3 = 61 wt%, MgO = 21.4%, FeO = 13.2%; spinel #2, Cr2O3 = 35.9%, Al2O3 = 33.0%, MgO = 17.9%, FeO = 13.1%; augite = Fs13Wo43. Oxygen isotope composition is somewhat outside the range of HED and closest to brachinites and IAB-IIICD irons (R. N. Clayton, UChi) : ä18O = +3.78‰, ä17O = +1.47‰, ä 17O = -0.50 ‰. Cosmic ray exposure age (O. Eugster, UBE): of 18.6+-2.0 Ma falls on the major CRE cluster of the HED meteorites. Not paired with NWA 1827 or 1879 mesosiderite C. Shock level, S1. Weathering grade. W1. Specimens: Type specimens 13.8 g, NAU, 11.5 g with O. Eugster, UBE; main mass. Fectay. kamacite, Ni = 4.8 to 5.4 wt %; taenite, Ni = 31.4 to 36.7%;

All the following pieces have crust and giant OPX.

				NWA 1982_a 48 gr thick 70% black crusted slice big OPX everywhere !! a Museum piece. 40 X 35 X 12 mm Price:  $1200
NWA 1982_b 11.5 gr  70% black crusted slice big OPX everywhere !! 30 X 35 X 3 mm Price:$280
				NWA 1982_c 17.5 gr thick 50%  crusted slice big OPX everywhere and metal vein !! 45 X 30 X 4 mm Price:  $430
NWA 1982_d 19 gr  50%  crusted slice big OPX everywhere and metal vein !! 50 X 30 X 4 mm Price: $475
				NWA 1982_e 14.5 gr  40%  crusted slice big OPX (1.2 cm....) 43 X 32 X 3 mm Price:  $360
NWA 1982_f 8.4 gr  30%  black crusted slice 27 X 30 X 3 mm Price: $210