Northwest Africa  1982

Morocco

Found 2000

Achondrite (ungrouped)

A 368 g partially crusted stone was purchased in Rissani 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; kamacite, Ni = 4.8 to 5.4 wt %; taenite, Ni = 31.4 to 36.7%; 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) : δ¹⁸O = +3.78‰, δ¹⁷O = +1.47‰, δ 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.