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Northwest Africa 15515
Basic information Name: Northwest Africa 15515
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15515
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 472 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 391 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeuphelp
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:
Place of purchase:Agadir, Morocco
Date:2015
Mass (g):472.4
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):31; 49±6.5 (n=16)
Wollastonite (mol%):6; 8±3.8
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):20
Type spec location:MNHNP
Main mass:Luc Labenne meteorites
Comments:Submitted by T. Shisseh
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2023)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Shisseh Taha         
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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