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Ramlat as Sahmah 531
Basic information Name: Ramlat as Sahmah 531
     This is an OFFICIAL meteorite name.
Abbreviation: RaS 531
Observed fall: No
Year found: 2014
Country: Oman
Mass:help 753 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  CV3.4
MB 113  (2024)  CVox3.4
Recommended:  CVox3.4    [explanation]

This is the only approved meteorite classified as CVox3.4.
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 22 Feb 2019
Revised 28 Mar 2024: Revised class based on metbull text
Writeuphelp
Writeup from MB 108:

Ramlat as Sahmah 531 (RaS 531)        20°10.568’N, 56°29.191’E

Al Wusta, Oman

Find: 2014 Nov

Classification: CV3.4

History: A fractured single stone was found as numerous specimens on an about 4 m2 area by an anonymous finder.

Petrography: Chondrite with well defined chondrules and CAIs set in an abundant fine grained iron-rich matrix (48 vol% by point counting, n=266). Chondrule average apparent diameter 690±360 μm (n=39). Opaques are mostly magnetite and sulfides. Based on the structural order of the polyaromatic matter assessed by Raman spectroscopy (L. Bonal, IPAG), this meteorite appears to be slightly less metamorphosed than Chainpur (type 3.4). The Raman spectroscopy parameters of interest are FWHM-D (cm-1)=158.0±23.9, ID/IG=1.02±0.05, N=6 (see Bonal et al. 2016, figure 6).

Geochemistry: Olivine Fa9.9±6.6, range Fa3.9-22.4, Fa PMD 52% (n=5). Cr2O3 in ferroan olivine 0.14±0.09 wt% (n=5). Orthopyroxene Fs2.2±0.2Wo2.4±1.7 (n=3). Defocused matrix analyses: FeO 28.1 wt%, total 100.0 wt%.

Classification: Carbonaceous chondrite (CV3.4). Oxidized subgroup. Subtype from Raman spectroscopy.

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Bibliography:
  • Bonal L., Quirico E., Flandinet L., and Montagnac G. (2016) Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochim. Cosmochim. Acta 189 312-337. (link)
Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Date:2014 Nov
Latitude:20°10.568'N
Longitude:56°29.191'E
Mass (g):753
Pieces:1
Class:CV3.4
Fayalite (mol%):9.9±6.6 (n=5)
Ferrosilite (mol%):2.2±0.2 (n=3)
Wollastonite (mol%):2.0±0.8
Magnetic suscept.:4.47
Classifier:J. Gattacceca, L. Krämer Ruggiu, CEREGE
Type spec mass (g):24.80
Type spec location:CEREGE
Main mass:Kuntz
Finder:anonymous
Comments:work name KK033; submitted by J. Gattacceca
Institutions
   and collections		 CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Kuntz: Fabien Kuntz, France; Website (private address)
IPAG: Institut de Planétologie et d’Astrophysique de Grenoble 414, Rue de la Piscine Domaine Universitaire 38400 St-Martin d’Hères , France (institutional address; updated 1 Aug 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:

Oman
Coordinates:
     Recommended::   (20° 10' 34"N, 56° 29' 11"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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