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Shalim 025
Basic information Name: Shalim 025
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Oman
Mass:help 463 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Shalim 025        18°22.56’N, 55°10.42’E

Dhofar, Oman

Find: 2018 Dec 1

Classification: Monomict Eucrite

History: The meteorite was found in the desert of central Oman by Dr. Sobhi Nasir

Physical characteristics: Physical Description (P. Hill, UWO) The sample has a millimeter thick, dark brown fusion crust present on all faces except one cut face. This fusion crust has large remaglypts on one of the sides, whereas the remaining sides are a smooth continuous surface. There are no contraction cracks present on this sample. The cut face has dark brown clasts surrounded by a beige white matrix. Several of the clasts exceed 1 cm in width. Certain portions of the crust show browning due to oxidization.

Petrography (P. Hill, UWO) The sample is a breccia containing numerous clasts of orthopyroxene and plagioclase. The clasts are poorly sorted and are sub-angular with one clast reaching up to 2 cm but most less than 0.5 mm across. Orthopyroxene (~70% area) and plagioclase (~30% area) make up most of the clasts and the groundmass. Thin (5 to 40 µm in width) exsolution lamellae of high Ca pyroxene are present within the grains of orthopyroxene. Troilite, native Fe, and Cr- and Ti-bearing oxides are present within both the clasts and the groundmass. No secondary alteration phases were observed and no FeO was identified using EDS suggesting the meteorite is fresh and hasn’t undergone extensive terrestrial alteration. The sample does show undulose extinction in the grains of plagioclase and pyroxene and irregular fractures were observed, but not in high abundance. Based on the shock stages put forward by Stöffler et al. (2018), the presence of undulatory extinction in plagioclase and pyroxene suggests a shock pressure range from 5 to 10-12 GPa.

Geochemistry: Mineral composition and geochemistry (P. Hill, M. Beauchamp UWO) low-Ca pyroxene (En58.9±1.0Fs37.4±1.2Wo3.7±2.2), high-Ca pyroxene (En41.2±1.9Fs15.8±3.1Wo43.1±5.0), and plagioclase (An91.8±0.7Ab7.8±0.6Or0.4±0.1).

Classification: Monomict eucrite

Specimens: 463 g type specimen, including polished thin section, are on deposit at SQU.

Bibliography:
  • Stöffler D., Hamann C., and Metzler K. (2018) Shock metamorphism of planetary silicate rocks and sediments: Proposal for an updated classification system. Meteorit. Planet. Sci. 53, 5-49. (link)
Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Dhofar
Date:2018 Dec 1
Latitude:18°22.56'N
Longitude:55°10.42'E
Mass (g):463
Pieces:1
Class:Monomict Eucrite
Shock stage:Weak
Weathering grade:low
Ferrosilite (mol%):36.2±5.1 (N=130)
Wollastonite (mol%):5.8±9.2 (N=130)
Classifier:P. Hill, N. Banerjee, G. Osinski, UWO; S. Nasir, SQU
Type spec mass (g):463
Type spec location:SQU
Main mass:SQU
Finder:Dr. Sobhi Nasir (SQU)
Comments:Submitted by P. Hill
Institutions
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
SQU: Sultan Qaboos University, College of Science, Earth Sciences Department, P.O. Box 36 Code 123 Al­Khoud, Oman (institutional address; updated 5 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Oman
Coordinates:
     Recommended::   (18° 22' 34"N, 55° 10' 25"E)

Statistics:
     This is 1 of 2131 approved meteorites from Zufar, Oman (plus 4 unapproved names)
     This is 1 of 3960 approved meteorites from Oman (plus 371 unapproved names)
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