NWA 1879, Rare Mesosiderite Type C, Micromount

$5.00
NWA 1879, Rare Mesosiderite Type C, Micromount

Description

This meteorite was recovered out of the Saharan Desert in Morocco in 2003. It was classified by Dr. Tony Irving at UWS and revealed to be a rare type of Mesosiderite (Type C - one of only seven known). It is a meteorite of mixed metal-rich zones and orthopyroxene-rich zones. These small fragments come from the orthopyroxene portion of the meteorite and have little or no metal.

Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing a small fragment like the one shown. Your purchase will include a labeled gemjar for safe storage.
 
From the Meteoritical Bulletin entry :

Northwest Africa 1879

Morocco

Purchased 2003 June

Mesosiderite

Two very fresh, complete, crusted specimens (total weight 1624 g) were purchased from a dealer in Erfoud for A. and G. Hupé (xHupé) in 2003 June. Classification and mineralogy (A. Irving and S. Kuehner, UWS): Mostly medium grained, relatively homogeneous assemblage of orthopyroxene (45%), plagioclase (15%), metal (20%), troilite (12%), chromite (8%) and accessory merrillite, with an unbrecciated, plutonic igneous texture. The two-phase Fe-Ni metal grains consist of rounded regions of taenite (30 wt.% Ni) within kamacite (5 wt.% Ni). Compositions of orthopyroxene (Fs29.8-31.0Wo3.1-3.5, FeO/MnO = 26.9-30.3) and plagioclase (An89.7-90.5Or0.3-0.6) are typical for mesosiderites, despite the lack of brecciation in this sample. Both this sample and NWA 1827appear to be part of a much larger, heterogeneous mesosiderite meteorite under study by A. Jambon (UPVI) and T. Bunch (NAU). Specimens: type specimens, 22 g and one polished thin section, UWS; 7 g and one polished thin section, NAU; main mass, xHupé.