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| Northwest Africa 13885 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13885 This is an OFFICIAL meteorite name. Abbreviation: NWA 13885 Observed fall: No Year found: 2021 Country: Algeria Mass:  2.61 kg | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 281 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
| Comments: | Approved 6 May 2021 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13885 (NWA 13885) Algeria Find: 2020 Classification: Martian meteorite (Shergottite) History: Found in December 2020 by meteorite hunters in who meandered from the Erg Chech 002 strewn field in Algeria. The specimen was later acquired by Darryl Pitt. Physical characteristics: A single curvilinear mass with patches of fusion crust in evidence on a smoothly textured greenish-hued surface accented throughout by the stippling of black grains. Saw-cut surface reveals a porphyritic texture with orange-brown olivine phenocrysts set in a light green-brown groundmass. The deposit sample slice displayed a prominent, dark colored, shock melt vein. Petrography: (C. Agee, UNM) This meteorite has the approximate modal abundances: 45% pyroxene, 30% olivine, 20% maskelynite, with accessory ilmenite, chromite, and troilite. Pyroxenes exhibit normal igneous zoning with patches of pigeonite and augite within single grains. Olivine phenocrysts are typically 1-3 mm in size. Pyroxene grains are often finer-grained but form cumulate masses as well. Maskelynite domains are usually seen as subhedral laths with typical dimensions of 100 × 500 μm. Geochemistry: (C. Agee, UNM) Olivine Fa45.0±3.4, Fe/Mn=53±3, CaO=0.23±0.07, (wt%), n=5; pyroxene Fs27.8±4.6Wo15.6±10.6, Fe/Mn=30±2, n=20; maskelynite An60.1±1.3Ab39.2±1.4Or0.7±0.2, n=6. Classification: Martian shergottite (olivine phyric basalt) Specimens: 20 g on deposit at UNM, Darryl Pitt holds the main mass. | ||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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| References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 1208 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||