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Ramlat as Sahmah 211
Basic information Name: Ramlat as Sahmah 211
     This is an OFFICIAL meteorite name.
Abbreviation: RaS 211
Observed fall: No
Year found: 2003
Country: Oman
Mass:help 143 g
Classification
  history:
Meteoritical Bulletin:  MB 93  (2008)  Chondrite-ung
Recommended:  Chondrite-ung    [explanation]

This is 1 of 24 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 14 Jan 2008
Revised 4 Aug 2008: final writeup
Writeuphelp
Writeup from MB 93:

Ramlat as Sahmah 211                   20°35.152'N, 55°52.351'E

Oman

Find: 16 January 2003

Ungrouped chondrite

History: A single stone was found during a search for meteorites by A. Al-Kathiri, M. Eggimann, B. Hofmann and U. Krähenbühl.

Physical characteristics: Angular brown stone, partially covered with thick black fusion crust.

Petrography: (E. Gnos, MHNGE; B. Hofmann, NMBE; A. Al-Kathiri, UBE/MCI) The metal content is very low and its distribution is inhomogeneous and clustered, forming isolated nuggets up to 5 mm. Only few relic chondrules can be recognized. Silicate and spinel grains contain abundant metal-sulfide droplets (micron-sized intergrowths). Ilmenite grains are also present. Shock stage S1, weathering W3 as based on finely distributed metal, only.

Mineral composition and Geochemistry: Average olivine composition is Fa31.3, (Fa30.0 XRD, M. Eggimann, UBE); average orthopyroxene composition is Fs26.2Wo2.0. Plagioclase (50-200 µm) shows a compositional range from An10.3 to An11.6. Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU): δ17O = 4.603, δ18O = 6.561, and Δ17O = 1.191 (all ‰). The δ17O value fits the LL field but δ18O is approximately 1 ‰ more positive.

Classification: Ungrouped chondrite related to ordinary chondrites (LL6) that deviates from this group in metal distribution and O isotopes.

Specimens: Type specimen and main mass NMBE.

Submitted by: Beda Hofmann, NMBE.

Data from:
  MB93
  Table 8
  Line 125:
Origin or pseudonym:Oman, desert plain
Date:16-Jan-03
Latitude:20°35.152'N
Longitude:55°52.351'E
Mass (g):143
Pieces:1
Class:Ungrouped C
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):31.3
Ferrosilite (mol%):26.2
Type spec mass (g):143
Plots: O isotopes:  
Institutions
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MHNGE: Muséum d’histoire naturelle, Route de Malagnou 1, CH-1211 Genève 6 , Switzerland (institutional address; updated 27 Oct 2011)
UBE: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Geography:

Oman
Coordinates:
     Recommended::   (20° 35' 9"N, 55° 52' 21"E)

Statistics:
     This is 1 of 1746 approved meteorites from Al Wusta, Oman (plus 72 unapproved names)
     This is 1 of 3942 approved meteorites from Oman (plus 371 unapproved names)
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