Ramlat Fasad 520        18°55.685’N, 53°25.453’E

Zufar, Oman

Find: 03 Feb 2017

Classification: Ureilite

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

Physical characteristics: Dark brown-olive wind ablated inidividual, 1.4 cm maximum dimension. No fusion crust.

Petrography: (S. Rout, E. Gnos, B. Hofmann) The meteorite consists dominantly of olivine and pigeonite with characteristic ureilitic texture, primary grain size is 1-3 mm. Large regions of olivine show secondary reduction with minute inclusions of Fe metal. All pyroxene grains show signatures of recrystallization and contain two types of pigeonites, enstatite, rare augite, interstitial glass and Fe-metal grains. Primary silicate grains show low shock (S2). Carbon platelets are irregular in shape, to 1 mm, consist of diamond and fine-grained graphite. Medium weathering (most iron metal oxidized, silicates are unaffected).

Geochemistry: (S. Rout, Bern) Olivine cores: Fa_19.3±0.4, Fe/Mn = 48±2, Cr₂O₃ 0.65±0.06 wt% (N = 44), reduced rims have Fa_9.9±3.9 (N = 19). Pigeonite cores: Fs_15.7/16.1Wo_10.8/10.9, Cr₂O₃ = 1.02/1.08 wt% (N = 2); recrystallized pigeonite: Fs_6.6±0.1Wo_8.2±3.6 (N = 5). Single augite grain: Fs_4.0Wo_36.9. Glass: Na₂O 2.4 wt%, CaO 4.1 wt%, Al₂O₃ 14.7 wt%, SiO₂ 72.9 wt% (N = 1).

Classification: Based on texture, mineralogy and geochemistry this is a ferroan ureilite. Paired with Ramlat Fasad 517.

Specimens: 0.26 g including one polished thin section at NMBE, main mass: MHTO