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Ramlat as Sahmah 517 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Ramlat as Sahmah 517 This is an OFFICIAL meteorite name. Abbreviation: RaS 517 Observed fall: No Year found: 2015 Country: Oman Mass: 16 g | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||||||
Comments: | Approved 21 May 2017 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Ramlat as Sahmah 517 (RaS 517) 20°08.14’N, 55°36.451’E Al Wusta, Oman Find: 12 Feb 2015 Classification: Ureilite History: A single stone was found during a search for meteorites. Physical characteristics: Greenish dark brown stone with well preserved fusion crust. Petrography: (Å. Rosén, Bern, B. Hofmann, NMBE, E. Gnos, MHNGE): The stone consists mainly of olivine, augite and low-Ca pyroxene (with inclusions of augite and olivine). The stone has a characteristic ureilitic texture. Olivine has reduced Fe-poor rims with minute inclusions of Fe metal. Metal at grain boundaries is only partly weathered. Carbon platelets (to 0.9 mm length) consist of dominant graphite and minor diamond. Few large (to 1.7 mm) skeletal zonated chromite grains are surrounded by a thin rim of silica- and aluminium-rich glass containing idiomorphic chromite (sub-micron to 20 μm), the small grains being concentrated at the border to the surrounding silicates. Thin glass rims also surround matrix silicates in association with secondary pyroxene. Geochemistry: (Å. Rosén, Bern) Olivine cores Fa22.7±0.2, Fe/Mn=46±1, Cr2O3=0.36±0.03 wt% (N = 33), reduced rims have Fa>4. Augite Fs12.2±0.2, Wo34.2±0.5 (N = 22). Low Ca pyroxene Fs18.9±0.2, Wo4.1±0.1 (N = 10). Mean reduced chromite composition is Cr2O3=55.9, Al2O3=19.8, FeOtotal=3.9, MnO=0.6, MgO=19.6, TiO2=0.7 wt% (N = 8), less reduced subgrain has composition Cr2O3=50.6, Al2O3=18.4, FeOtotal=19.0, MnO=0.2, MgO=9.8, TiO2=0.7 wt% (N = 1). Classification: Based on texture and mineralogy this is an augite-bearing, monomict ureilite. Low weathering. Specimens: All at NMBE | ||||||||||||||||||||||||||||||||||
Data from: MB106 Table 0 Line 0: |
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Institutions and collections |
NMBE: Natural History Museum Bern
Bernastrasse 15
CH-3005 Bern
Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012) MHNGE: Muséum d’histoire naturelle, Route de Malagnou 1, CH-1211 Genève 6 , Switzerland (institutional address; updated 27 Oct 2011) Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address) |
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Catalogs: |
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References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: |
Statistics: This is 1 of 1759 approved meteorites from Al Wusta, Oman (plus 75 unapproved names) This is 1 of 4006 approved meteorites from Oman (plus 433 unapproved names) | ||||||||||||||||||||||||||||||||||
Proximity search: | |||||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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