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| Northwest Africa 15515 | |||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 15515 This is an OFFICIAL meteorite name. Abbreviation: NWA 15515 Observed fall: No Year found: 2015 Country: Morocco Mass:  472 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 425 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
| Comments: | Approved 7 Jan 2023 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Northwest Africa 15515 (NWA 15515) Morocco Find: 2015 Classification: HED achondrite (Eucrite, polymict) History: This meteorite was purchased by Luc Labenne in Agadir, Morocco, from a Moroccan dealer. Physical characteristics: (T. Shisseh, R. Hewins, FSAC, MNHNP) Slices of this rock reveal a brecciated interior with rounded and angular clasts and mineral fragments embedded in a fine-grained matrix. Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, H. Chennaoui Aoudjehane, S. Pont, FSAC, MNHNP) Scanning electron microcopy examination of two polished sections of this rock shows basaltic and cumulative clasts set in a fragmental matrix. Both equilibrated and unequilibrated pyroxenes are present. The thickness of augite lamellae in equilibrated pyroxene ranges from 1 to 10 µm. Plagioclase laths in basaltic clasts are ~1 mm long and 100 µm in width. Plagioclase in cumulate clasts is up to 3 mm in size. The matrix encloses an impact spherule up to 2 mm in diameter. Silica grains with pyroxene rims are found. Minor mineral phases include silica, chromite, ulvöspinel, ilmenite. Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxene in cumulative clasts is En63Fs31Wo6 (Fe/Mn=31.5; Mg# =67; n=1). Low-Ca pyroxene in basaltic clasts is En43±6.6Fs49±6.5Wo8±3.8 (Fe/Mn=32; Mg# =47; n=16). High-Ca pyroxene is En34±1.7Fs41±4.7Wo25±6.2 (n=5). Plagioclase is An82-92) (n=8). Average TiO2 and FeO contents in ilmenite are 53 wt% and 43.8 wt%, respectively (n=2). Classification: (T. Shisseh, R. Hewins, FSAC, MNHNP) Polymict eucrite. This meteorite is composed of basaltic and cumulate eucrite lithologies. | ||||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Institutions and collections |
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013) Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012) |
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| Catalogs: |
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| References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Geography:
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Statistics: This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||