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Northwest Africa 15518
Basic information Name: Northwest Africa 15518
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15518
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 3.2 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 15518 (NWA 15518)

Morocco

Find: 2015

Classification: HED achondrite (Eucrite, polymict)

History: This meteorite was purchased by Luc Labenne in Laâyoune, Morocco, from an anonymous Moroccan dealer.

Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, H. Chennaoui Aoudjehane, S. Pont, FSAC, MNHNP) Scanning electron mosaic map of this rock reveals a brecciated texture, with clasts exhibiting a wide range of sizes and textures, embedded in a matrix composed of glass and mineral fragments. The major mineral phases are pyroxene and plagioclase. Pyroxene is equilibrated, and contains exsolution lamellae of augite. Plagioclase is generally clear, but some has tiny inclusions of pyroxene, silica and oxides following crystallographic directions. Schlieren and pools of melted plagioclase are observed in the matrix. Minor phases are silica, chromite, ulvöspinel, ilmenite, troilite and olivine. Shock veins are crossing the clasts and the matrix.

Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxene composition is En49Fs49Wo2 (Fe/Mn=32; Mg# =50; n=1) and En42±0.7Fs56±1Wo2±0.2 (Fe/Mn=29±1.8; Mg# =43; n=3). High-Ca pyroxene is s En33±0.3Fs23±1.5Wo44±1.1 (n=3). Plagioclase is An88.5-92.5Or0.24-0.25 (n=4). Ilmenite has 57 wt% TiO2 and 43 wt% FeO (n=1).

Classification: (T. Shisseh, R. Hewins, FSAC, MNHNP) Polymict eucrite.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Laâyoune, Morocco
Date:2015
Mass (g):3.2
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):49; 56±1 (n=3)
Wollastonite (mol%):2; 2±0.2
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):0.7
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:
Find references in Google Scholar:
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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