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Ramlat as Sahmah 287
Basic information Name: Ramlat as Sahmah 287
     This is an OFFICIAL meteorite name.
Abbreviation: RaS 287
Observed fall: No
Year found: 2009
Country: Oman
Mass:help 1962 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 422 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 21 Sep 2012
Writeuphelp
Writeup from MB 101:

Ramlat as Sahmah 287 (RaS 287)        20°28.607’N, 55°31.673’E

Al Wusta, Oman

Found: 21 Jan 2009

Classification: HED achondrite (Diogenite)

History: A large individual of 1958.6 g and one small fragment (3.361 g) were found during a search for meteorites by N. Dalcher, N. Greber, B. Hofmann, S. Lorenzetti and F. Zurfluh.

Physical characteristics: Greenish-grey rock, partly covered with black fusion crust, total mass 1962.0 g.

Petrography: (B. Hofmann, NMBE, F. Zurfluh, E. Gnos, MHNGE): The rock shows a brecciated texture with large orthopyroxene clasts (2-5 mm) in a fine-grained (0.2-0.4 mm) matrix. Other phases are minor chromite and accessory troilite and Fe metal, forming inclusion trails in orthopyroxene and chromite.

Geochemistry: Pyroxene composition Fs27.6Wo2.2. Bulk analysis shows MgO 25.2%, Fe/Mn = 29.1. Oxygen isotopes (I.A. Franchi and R.C. Greenwood, OU): Analyses of a bulk sample yielded δ17O = 1.53, δ18O = 3.38, and Δ17O = -0.23 per mil (mean of 2 replicates).

Classification: Based on texture, bulk Fe/Mn, mineralogy and oxygen isotopes this is a diogenite.

Specimens: All at NMBE.

Data from:
  MB101
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Origin or pseudonym:desert plain
Date:21 Jan 2009
Latitude:20°28.607'N
Longitude:55°31.673'E
Mass (g):1962.0
Pieces:2
Class:Diogenite
Wollastonite (mol%):2.2
Classifier:F. Zurfluh IFGBE, B. Hofmann NMBE, E. Gnos MHNGE
Type spec mass (g):1962.0
Type spec location:NMBE
Main mass:NMBE
Finder:N. Dalcher, N. Greber, B. Hofmann, S. Lorenzetti, F. Zurfluh
Comments:Submitted by B.A. Hofmann
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Geography:

Oman
Coordinates:
     Recommended::   (20° 28' 36"N, 55° 31' 40"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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