Mesosiderite, group 2C
(group 2B in MetBull 88)
Found 2002
no coordinates recorded
A very small fusion-crusted stone weighing only 13.52 g was purchased in Erfoud, Morocco in March 2003. Analysis and classification was completed at Northern Arizona University. This mesosiderite exhibits only minor recrystallization, and it has a matrix composed predominantly of large orthopyroxene grains along with some plagioclase, features which are consistent with assignment to subgroup 2C. Although the MetBull #88 lists NWA 1912 as belonging to subgroup 2B, it is considered more likely to be a member of the rare subgroup 2C, as a member of the NWA 1827 pairing group (Bunch et al., 2004).
Northwest Africa 1912 is an unshocked meteorite (S1) that shows only minor signs of weathering. The specimen in the photo above is a 0.64 g partial slice, which exhibits green orthopyroxene fragments in a metallic matrix, along with lesser amounts of anorthitic plagioclase, chromite, troilite, and silica.
