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| Shalim 025 | |||||||||||||||||||||||||||||||||||
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| 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:  463 g | ||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 272 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||||||
| Comments: | Approved 29 Feb 2020 | ||||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| Data from: MB109 Table 0 Line 0: |
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| 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) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 2168 approved meteorites from Zufar, Oman (plus 22 unapproved names) This is 1 of 4002 approved meteorites from Oman (plus 434 unapproved names) | ||||||||||||||||||||||||||||||||||
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