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Ramlat as Sahmah 420
Basic information Name: Ramlat as Sahmah 420
     This is an OFFICIAL meteorite name.
Abbreviation: RaS 420
Observed fall: No
Year found: 2010
Country: Oman
Mass:help 70.3 g
Meteoritical Bulletin:  MB 101  (2012)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 629 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 11 Jul 2012
Writeup from MB 101:

Ramlat as Sahmah 420 (RaS 420)        20°25.023’N, 56°16.495’E

Al Wusta, Oman

Found: 2010 Feb 5

Classification: Ureilite

History: A single stone of 70.3 g was found during a search for meteorites.

Physical characteristics: Greenish brown, partly wind-abraded stone, fusion crust is partly preserved.

Petrography: (B. Hofmann, NMBE, F. Zurfluh, Bern, E. Gnos, MHNGE): The stone consists of olivine and pyroxene, with characteristic ureilitic texture. Olivine has reduced Fe-poor rims with minute inclusions of Fe metal. Larger metal at grain boundaries is completely weathered. Carbon platelets (to 0.9 mm length) consisting of graphite and diamond are abundant along silicate grain boundaries of. Shock stage is S2 based on (annealed?) silicates.

Geochemistry: Compositional ranges of silicates are Fa4.8-20.8 and Fs16.8 Wo8.0(7.9-8.4) (range Fs16.4-17.2Wo7.9-8.4). Bulk Fe/Mn=52.3 wt%, Ni 1010 ppm.

Classification: Based on texture and mineralogy this is a ureilite.

Specimens: All at NMBE.

Data from:
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Origin or pseudonym:desert plain
Date:2010 Feb 5
Mass (g):70.298
Fayalite (mol%):20.2
Ferrosilite (mol%):16.8
Wollastonite (mol%):8
Magnetic suscept.:4.28
Classifier:F. Zurfluh, Bern; B. Hofmann, NMBE; and E. Gnos, MHNGE
Type spec mass (g):70.3
Type spec location:NMBE
Main mass:NMBE
Finder:A. Bretscher, B. Hofmann, C. Opitz, R. Trappitsch, F. Zurfluh
Comments:Submitted by Beda Hofmann
   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)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     Recommended::   (20° 25' 1"N, 56° 16' 30"E)

     This is 1 of 1756 approved meteorites from Al Wusta, Oman (plus 75 unapproved names)
     This is 1 of 4001 approved meteorites from Oman (plus 436 unapproved names)
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