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Ramlat as Sahmah 517
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:help 16 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 594 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 21 May 2017
Writeuphelp
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:
State/Prov/County:Al Wusta
Origin or pseudonym:Desert plain
Date:12 Feb 2015
Latitude:20°08.14'N
Longitude:55°36.451'E
Mass (g):15.969
Pieces:1
Class:Ureilite
Fayalite (mol%):22.7±0.2 (N = 33)
Ferrosilite (mol%):18.9±0.2 (N = 10)
Wollastonite (mol%):4.1±0.1 (N = 10)
Classifier:B. Hofmann, Å. Rosén, E. Gnos
Type spec mass (g):15.969
Type spec location:NMBE
Main mass:NMBE
Finder:Åke Rosén, Edwin Gnos, Beda Hofmann
Comments:Submitted by Beda Hofmann
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)
Catalogs:
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:

Oman
Coordinates:
     Recommended::   (20° 8' 8"N, 55° 36' 27"E)

Statistics:
     This is 1 of 1755 approved meteorites from Al Wusta, Oman (plus 75 unapproved names)
     This is 1 of 3999 approved meteorites from Oman (plus 434 unapproved names)
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