Name: Northwest Africa 7464
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7464
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 2.26 kg
Recommended: Diogenite [explanation]
Writeup from MB 102:
Northwest Africa 7464 (NWA 7464)
Purchased: 2012 July
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.
Data from MB102, Table 0, Line 0:
Place of purchase: Morocco
Date: P 2012 Jul
Mass (g): 2263
Shock stage: moderate
Weathering grade: low
Fayalite (mol%): 25.1-28.3
Ferrosilite (mol%): 24.7-25.5; 10.4
Wollastonite (mol%): 3.7-3.4; 43.4
Classifier: A. Irving and S. Kuehner, UWS
Type spec mass (g): 28.3
Type spec location: UWB
Main mass: G. Fujihara, T. Jakubowski, A. Bates
Comments: GF12-7; submitted by A. Irving