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| Northwest Africa 15113 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 15113 This is an OFFICIAL meteorite name. Abbreviation: NWA 15113 Observed fall: No Year found: 2018 Country: Morocco Mass:  25.1 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 15 approved meteorites classified as Mesosiderite-A3. [show all] Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 6 Aug 2022 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Northwest Africa 15113 (NWA 15113) Morocco Purchased: 2018 Classification: Mesosiderite (group A3) History: Sample was purchased in 2018 from M. Ismali at the Tucson mineral show who acquired it from Morocco. Main mass location unknown. Sample is catalogued at the Royal Ontario Museum as M59830. Physical characteristics: A rusty limonite weathered, boomerang-shaped piece showing ridges and regmalypted surfaces similar to irons. Petrography: Cut surfaces (7 cm2) shows ragged sub-cm scale interfingering of metal with silicates. Metal appears to be interstitial to the silicates. In polished thin section, elongate metal grains of up to 1 cm length have irregular, embayed contacts with an enclosing silicate matrix composed mainly of mottled low Ca pyroxene, with 25 vol% clear subhedral feldspar, Ca-rich pyroxene and fragmental olivine grains. Olivine, pyroxene and feldspar typically show sharp extinction, with few grains exhibiting undulatory extinction. Metallic content comprises 35 vol% of sample. Fe oxides occur locally surrounding metal and filling cracks. In BSE images, matrix and clast silicates appear to be highly metamorphosed, with simplified recrystallized boundaries. Geochemistry: EPMA: Olivine Fa19.21±10.10 (n=25), large olivine grain Fa9.84±0.48 (n=9), Ca-poor pyroxene Fs28.79±7.32Wo3.59±1.23 (n=21); Ca-rich pyroxene Wo41.65±1.93Fs15.45±1.24 (n=9). Magnetic susceptibility measured for a 13.9 g endpiece is log χ (× 10-9 m3/kg) = 5.71. Classification: Mesosiderite A3, low shock, low weathering. Textural exidence for recrystallization contrasts with large variation in olivine grain compositions. Specimens: Type specimen location: ROM. Main mass: DGregory. | ||||||||||||||||||||||||||||||||
| Data from: MB111 Table 0 Line 0: |
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| Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) 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) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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| Catalogs: |
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| References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:
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Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||
| Also see: |
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| Revision history: |
This lists important revisions made to data for this record.
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