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Northwest Africa 15508
Basic information Name: Northwest Africa 15508
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15508
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 3.38 g
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 127 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15508 (NWA 15508)

Morocco

Find: 2014

Classification: HED achondrite (Eucrite, unbrecciated)

History: This meteorite was found near Tirhert in Morocco in 2014, and was purchased by Luc Labenne in Agadir from an anonymous Moroccan dealer.

Physical characteristics: (T. Shisseh, R. Hewins, FSAC, MNHNP) A single stone with a black and shiny fusion crust. The interior shows white plagioclase grains, brown pyroxenes and black opaques.

Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, S. Pont, H. Chennaoui Aoudjehane, FSAC, MNHNP) An unbrecciated rock with a subophitic texture. The fusion crust is up to 150 µm in thickness, and it contains vesicles (40 µm in diameter) and mineral fragments. The main mineral phases are plagioclase and pyroxene. Minor mineral phases include silica, chromite, ulvöspinel, ilmenite, troilite and metal. Plagioclase laths are up 2 mm long and 0.5 mm wide, and they contain pyroxene, silica and oxide inclusions following crystallographic directions. The main pyroxene phase is pigeonite, but scarce augite grains are also present. Mosaicism in pyroxene is observed. Pigeonite contains 8-40-µm-thick augite lamellae, as well as discontinuous rods and lenses of plagioclase and oxides. Remnant Ca-zoning in pyroxene is abundant, with augite lamellae decreasing in thickness toward the pyroxene cores. In some cases, augite lamellae in pigeonite are bended or faulted. Granular late-stage mesostasis is composed of silica, augite and ilmenite, and mostly occurs between plagioclase laths.

Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxene is En35.54±0.5Fs58.3±0.5Wo6.1, with Fe/Mn=32 and Mg# =38 (n=2). Augite is En29.3±0.1Fs28.8±0.3Wo41.8± 0.5 (n = 2). Plagioclase is An88.9±0.8Ab10.68±0.7Or0.42±0.1 (n=4). The TiO2 and FeO contents of ilmenite are 55.9 wt% and 44 wt%, respectively (n=1).

Classification: (T. Shisseh, R. Hewins, FSAC, MNHNP) Unbrecciated eucrite. The meteorite contains anorthite, and pyroxene with Fe/Mn ratios matching eucrites, plus typical eucritic textures.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Agadir, Morocco
Date:2014
Mass (g):3.38
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:None
Ferrosilite (mol%):58.3±0.5 (n=2)
Wollastonite (mol%):6,1
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):2.5
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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