Found June 2000
Carbonaceous chondrite (CH)
An 18.1 g crusted stone was found north of Legaaida by a person prospecting for meteorites. Mineralogy and classification (T. Bunch and J. Wittke, NAU): similar to Allan Hills 85085 in texture, mineral modes (pyroxene/olivine = 3:1, Fe-Ni metal = 27 vol. %), and chondrule size (mean diameter = 23 μm), but with few "matrix lumps"; contains small, subrounded CAIs with pure gehlenite (MgO = 0.3 wt. %) and micron-sized perovskite; 80% of chondrules are cryptocrystalline, and consist of stoichiometric enstatite (FeO = 0.24 wt. %) and forsterite (FeO = 1.1 wt. %); rare refractory chondrules have Al-rich diopside cores with spinel inclusions and forsterite rims (FeO = 0.45 wt. %); metal grains average Ni = 6.1 wt. % and Cr = 0.47 wt. %; shock stage, S2; weathering grade, W1. Specimens: 3.2 g plus thin section, NAU; main mass with finder.
Carbonaceous chondrite (CH3)
History and physical characteristics: A 23 g stone with minor fusion crust was purchased in Morocco in 2007.
Petrography (T. Bunch and J. Wittke, NAU): Consists of small (10 µm to 60 µm diameter) Mg-rich cryptocrystalline chondrules of enstatite (73 % of these chondrules, N = 45) and forsterite (27 %), larger chondrules (80-140 µm) and chondrule fragments of similar compositions and textures, chondrules that contain Fe-rich olivine, large PP, GO, and GOP chondrules, Cr-bearing kamacite and taenite, and sulfides. Rare plagioclase occurs as fragments and in chondrules.
Geochemistry: Small chondrule enstatite = Fs0.3-1.8Wo0.8; forsterite = Fa0.2–6.0, Cr2O3 mean = 0.56 wt%; cpx = Fs1.5Wo33, Al2O3 = 11.1 wt%. Fe-rich chondrule olivine = Fa25-42, Cr2O3 mean = 0.67 wt%, FeO/MnO = 100 to 115. Metal Cr content = 0.25 to 0.48 wt% and FeS Ni = 1.2 – 3.5 wt%. Plagioclase is An89-98. Feldspathic glasses in Mg-rich chondrules contain K2O up to 2.8 wt%. Classification: Carbonaceous chondrite (CH3).
Type specimen: A total of 4.6 g are on deposit at the Field Museum of Natural History together with the main mass.