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Northwest Africa 15516
Basic information Name: Northwest Africa 15516
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15516
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 330 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15516 (NWA 15516)

Morocco

Find: 2015

Classification: HED achondrite (Eucrite, monomict)

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

Physical characteristics: (T. Shisseh, R. Hewins, FSAC, MNHNP) This rock is composed of coarse-grained clasts and mineral fragments, set in a grey and white groundmass.

Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, H. Chennaoui Aoudjehane, S. Pont, FSAC, MNHNP) Scanning electron microcopy examination of three polished sections of this sample reveals a brecciated texture. The rock contains equal amount of pyroxene and plagioclase. Pyroxene is mainly pigeonite with exsolved lamellae of augite up to 45 µm in width. Faulting and displacement of these lamellae are frequently observed. Plagioclase is up to 4 mm in size, and is strongly fractured. Rare rods of oxides are crossing pyroxene. Silica grains are up to in size. spinels (chromite/ulvöspinel) and ilmenite are found.

Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxene is En51±0.78Fs47±0.7Wo2±1.4 (Fe/Mn=32.5; Mg# =52; n=4). Exsolution lamellae of augite are En38±0.3Fs19±0.3Wo43±0.4 (n=3). Plagioclase is An82-92) (n=8). The TiO2 and FeO contents in ilmenite range from 45 to 52 wt% and 41 to 44 wt%, respectively (n=2).

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

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Laâyoune, Morocco
Date:2015
Mass (g):330
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):47±0.7 (n=4)
Wollastonite (mol%):2±1.4
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:
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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