0.235g part slice
Sold in collection box with label/certificate of authenticity
Northwest Africa 11031 (NWA 11031)
Purchased: 2016 Jun
Classification: HED achondrite (Eucrite, polymict)
History: Purchased by Fabien Kuntz in June 2016 from a dealer in Ouarzazate, Morocco.
Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of sparse ophitic eucrite clasts and abundant related crystal debris in a finer grained matrix. Minerals are unexsolved low-Ca pyroxene (pigeonite), high-Ca pyroxenes, calcic plagioclase, silica polymorph, fayalitic olivine, chromite, ilmenite (with included baddeleyite), troilite and Ni-free metal. Some grains of hedenbergite+fayalite+silica symplectite (after pyroxferroite) are present.
Geochemistry: Low-Ca pyroxene (Fs33.9-36.5WoWo5.6-7.0, FeO/MnO = 28; Fs59.0Wo5.1, FeO/MnO = 31; N = 2), high-Ca pyroxene (Fs43.3Wo24.6, FeO/MnO = 29; Fs55.4Wo32.8, FeO/MnO = 34; N = 2), fayalitic olivine (Fa85.4, FeO/MnO = 42).
Classification: Eucrite (polymict breccia).
Specimens: 24.59 g including one polished thin section at PSF; remainder with Kuntz.