Meteoritical Bulletin: Entry for Ramlat as Sahmah 511

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Ramlat as Sahmah 511

Basic information

Name: Ramlat as Sahmah 511
This is an OFFICIAL meteorite name.
Abbreviation: RaS 511
Observed fall: No
Year found: 2013
Country: Oman
Mass: 10.4 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 26 Dec 2015

Writeup

help

Writeup from MB 104:

Ramlat as Sahmah 511 (RaS 511) 20°30.025’N, 55°31.458’E

Al Wusta, Oman

Find: 3 Feb 2013

Classification: HED achondrite (Eucrite)

History: Found by Edwin Gnos, Beda Hofmann, Urs Eggenberger, Thomas Burri and Pete Stephenson during a search for meteorites on February 3, 2013.

Physical characteristics: Strongly wind-ablated greenish-grey fragment with deep erosion holes, no fusion crust, 10.44 g.

Petrography: (B. Hofmann, NMBE and E. Gnos, MHNGE) Brecciated texture, consisting of partially maskelynitized plagioclase, pyroxene displaying several sets of PDFs, ilmenite, chromite and sparse troilite. Clast size up to 4 mm, predominantly coarse grained with 0.2-0.6 mm sized mineral grains.

Geochemistry: (N. Greber, Bern) Orthopyroxene compositions are Fs_58.2±1.9Wo_3.8±1.4(Fs_54.0-60.8Wo_2.0-6.5), Fe/Mn = 31.3 (n=10), clinopyroxene compositions are Fs_26.6±1.0Wo_40.2±5.7(Fs_25.5-28.0Wo_30.4-43.0), Fe/Mn = 31.8 (n=5), plagioclase compositions are An_88.6±2.4Or_1.3±2.6(An_81.9-90.4Or_0.3-8.7, n=10). Bulk analysis of cut surface by XRF (wt%): Fe 13.1, Mn 0.38 (Fe/Mn 34.2). Oxygen isotopes: (R. Greenwood, OU): δ¹⁸O=4.08, δ¹⁷O=1.92, Δ¹⁷O=-0.21.

Classification: Based on petrography and geochemistry, this meteorite is a strongly shocked eucrite breccia.

Specimens: All at NMBE

Data from:
  MB104
  Table 0
  Line 0:

State/Prov/County:	Al Wusta
Origin or pseudonym:	Desert plain
Date:	3 Feb 2013
Latitude:	20°30.025'N
Longitude:	55°31.458'E
Mass (g):	10.4
Pieces:	1
Class:	Eucrite
Shock stage:	S4
Ferrosilite (mol%):	58.2±1.9 (N=10)
Wollastonite (mol%):	3.8±1.4 (N=10)
Classifier:	B. Hofmann, N. Greber, E. Gnos
Type spec mass (g):	10.4
Type spec location:	NMBE
Main mass:	NMBE
Finder:	Thomas Burri, Urs Eggenberger, Edwin Gnos, Beda Hofmann, Pete Stephenson
Comments:	Submitted by Beda 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)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Oman

Oman

Coordinates:
Recommended::	(20° 30' 2"N, 55° 31' 27"E)

Statistics:
This is 1 of 1780 approved meteorites from Al Wusta, Oman (plus 81 unapproved names)
This is 1 of 4526 approved meteorites from Oman (plus 419 unapproved names)

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