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Northwest Africa 15514
Basic information Name: Northwest Africa 15514
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15514
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 1.2 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 71 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15514 (NWA 15514)

Morocco

Find: 2014

Classification: HED achondrite (Eucrite, melt breccia)

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

Physical characteristics: (T. Shisseh, R. Hewins, FSAC, MNHNP) a flat slice with rock fragments embedded in a dark and vesicular matrix.

Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, H. Chennaoui Aoudjehane, S. Pont, FSAC, MNHNP) This specimen is an impact melt breccia that contains rounded basaltic clasts and fragments set in a matrix of glass and devitrified glass. The clasts are predominately subophitic, and range from 1 to 4 mm in diameter. The major mineral phases are pyroxene and plagioclase. Minor mineral phases include silica, ilmenite, spinels (chromite and ulvöspinel) and zircon. Plagioclase within the clasts ranges from 30 to 200 µm in width. Schlieren of melted plagioclase with vesicles is present in the matrix. Pyroxene contains exsolution lamellae of augite with a wide range of thicknesses. Glassy shock veins crossing the clasts are abundant, and often contain entrained pyroxene and plagioclase fragments.

Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxene is En35±0.3Fs58.5±0.4Wo6.5±0.2 (Fe/Mn=32; Mg# =38; n=6). High-Ca pyroxene is En29.6±0.4Fs29.7±1.5Wo40.7±2 (n=7). Plagioclase is An87.5-89 (n=4). Average TiO2 and FeO contents in ilmenite are 53 wt% and 44 wt%, respectively (with <1.4 wt% MgO, MnO and Cr2O3 contents; n=4).

Classification: (T. Shisseh, R. Hewins, FSAC, MNHNP) Eucrite melt breccia. This meteorite contains anorthite, and pyroxene with Fe/Mn ratios matching those of eucrites, plus typical brecciated eucritic textures.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Laâyoune, Morocco
Date:2014
Mass (g):1.2
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):58.5±0.4 (n=6)
Wollastonite (mol%):6.5±0.2
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):0.24
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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