Northwest Africa 7464 (NWA 7464)
Purchased: 2012 Jul
Classification: HED achondrite (Diogenite)
History: Purchased from a Moroccan dealer by Gary Fujihara, Tomek Jakubowski and Adam Bates in July 2012.
Physical characteristics: Among the various stones constituting this find, most are extremely fresh, but some have iron oxide staining (presumably as a result of variable distribution and degree of weathering of accessory iron metal).
Petrography: (A. Irving and S. Kuehner, UWS) Texturally, the material consists of larger crystal fragments in a matrix of finer, angular grains of the same minerals – this could be termed a matrix-poor breccia, cataclastic or mortar texture. The predominant mineral is orthopyroxene accompanied by accessory olivine, clinopyroxene, anorthite, chromite, Ni-poor metal (more stained in some stones) and troilite.
Geochemistry: Orthopyroxene (Fs24.7-25.5Wo3.7-3.4; FeO/MnO = 27-31), olivine (Fa25.1; Fa28.3; FeO/MnO = 48-50), clinopyroxene (Fs10.4Wo43.4; FeO/MnO = 22).
Specimens: 28.3 g of sample and one polished thin section are on deposit at UWB. The remaining material is held jointly by Gary Fujihara, Tomasz Jakubowski and Adam Bates.
Source: MetBull – http://www.lpi.usra.edu/meteor/index.php