Ramlat Fasad 525        18°56.129’N, 53°17.212’E

Zufar, Oman

Find: 05 Feb 2018

Classification: Ureilite

History: A complete individual was found during a search for meteorites.

Physical characteristics: Rounded inidivual with adhering sand crust, wind ablated, no fusion crust.

Petrography: (J. Pape, E. Gnos, B. Hofmann) The sample consist mainly of olivine and low-Ca pyroxene with rare augite inclusions. The sample is relatively fine-grained (~0.5-1 mm) and shows the characteristic ureilitic, equigranular texture, some low-Ca pyroxenes have poikilitic olivine inclusions. Silicates show low shock (S2). Olivine grains show gentle Fe-reduction in the rims (width 20-30 μm) with very minor Fe metal inclusions, partly oxidized due to weathering. Well crystallized graphite platelets (up to 0.6 mm length), no diamond was observed. Moderate weathering (most iron oxidized, silicates are unaffected).

Geochemistry: (J. Pape, NMBE) Olivine cores Fa_11.9±0.2, Fe/Mn 19±1, Cr₂O₃ 0.57±0.03 wt% (N = 19), reduced Ol rims have Fa>2.7. Low-Ca pyroxene has Fs_10.4±0.1Wo_5.0±0.05, Cr₂O₃ 1.03±0.02 wt% (N = 33), reduced Px rims have Wo>1.1. Augite has Fs_6.3±0.0Wo_37.6±0.1 (N = 2).

Classification: Based on texture, mineralogy and geochemistry this is an unbrecciated, monomict and augite-bearing magnesian ureilite.

Specimens: All at NMBE, including one polished thin section.