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| Northwest Africa 13289 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13289 This is an OFFICIAL meteorite name. Abbreviation: NWA 13289 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass:  387 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 322 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 2 May 2020 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 13289 (NWA 13289) (Northwest Africa) Purchased: 2019 Classification: Martian meteorite (Shergottite) History: Marc Jost (SJS) purchased the 387.4g sample from Aziz Mouadine in Rissani, Morocco, in July, 2019. Physical characteristics: Sample is irregular in shape and has a dark-brown, wind ablated surface. One portion of the stone contains a coating of orange caliche. The cut face shows an igneous texture composed of light greenish-gray colored interlocking crystals. Petrography: Description and Classification (A. Love, App) Sample has an diabasic texture composed of 62 vol% chaotically-zoned, prismatic pyroxenes (568 μm avg. length), 34 vol% lath-shaped maskelynite (781 μm in length), Fe-Ti oxides with ilmenite lamellae, 2 vol% merrillite, mesostasis, pyrrhotite. Some pyroxenes show ~1um exsolution lamellae. Maskelynite is zoned with K-bearing rims (An45Or4) and more calcic cores (An49Or2). Geochemistry: (A.Love, App) Pyroxenes show two compositional trends: pigeonite (Fs35.7-59.1Wo9.9-20.8, average Fs48.2±7.9Wo15.2±3.6, Fe/Mn=35.2±2.6, n=21) and augite (Fs20.0-46.7Wo36.5-28.5, average Fs48.2±6.8Wo32.3±2.0, Fe/Mn=30.3±3.0, n=26). Ferropigeonite (Fs67.7±2.9Wo17.1±0.1, Fe/Mn=36.8±1.8, n=2). Maskelynite (An47.5±5.2Or2.7±1.7, n=18). Classification: Martian (basaltic shergottite). Based on chaotic patchy zonation, distinctive compositions and Fe/Mn ratios of pyroxenes and compositions of maskelynite, this sample is a martian meteorite. Mineralogy and textures suggest this is a basaltic shergottite, M-S4 (Stöffler et al., 2018) low weathering grade. Specimens: Marc Jost (SJS) holds the main mass. A polished thin section, an endcut, a slice and few fragments weighing 21.87 g are on deposit at App. | ||||||||||||||||||||||||||||||||
| Bibliography: |
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| Data from: MB109 Table 0 Line 0: |
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| Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||||
| Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
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| Revision history: |
This lists important revisions made to data for this record.
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