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Northwest Africa 15509
Basic information Name: Northwest Africa 15509
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15509
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 4.4 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeup from MB 112:

Northwest Africa 15509 (NWA 15509)


Find: 2014

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) A single stone that consists of a dark matrix enclosing clasts and mineral fragments.

Petrography: (T. Shisseh, R. Hewins, B. Zanda, E. Jacquet, H. Chennaoui Aoudjehane, S. Pont, FSAC, MNHNP) Brecciated rock with angular, subrounded and rounded clasts and mineral fragments embedded in a glassy and vesicular matrix. Clasts are up to 4 mm in diameter, and exhibit granoblastic, subophitic, ophitic and granular textures. Plagioclase reaches up to 0.7 mm in width, and contains inclusions of pyroxene, silica and oxides. Blobs and schlieren of melted plagioclase are present within the matrix. The predominant pyroxene phase is pigeonite, with augite lamellae ranging from <1 µm to 30 µm in thickness. Pigeonite lamellae in augite is also present. The majority of lamellae are bended and faulted. Minor mineral phases include silica, chromite, ulvöspinel, ilmenite, late-stage olivine and troilite.

Geochemistry: (T. Shisseh, R. Hewins, FSAC, MNHNP) Low-Ca pyroxenes are En47±0.75Fs51±1Wo2±0.4 (Fe/Mn=31; Mg# =48; n=14), and En37±7Fs60±2Wo3±1.5 (Fe/Mn=30; Mg# =38; n=8). Augite lamellae in magnesian pigeonite are En37±2Fs21±2Wo42±3.9 (n=11), and in ferroan pigeonite are En30±0.9Fs27±1Wo43±1.3 (n=9). Plagioclase is An89-94 (n=7). Late-stage olivine is Fa69.5±0.7Fo30.3±0.7 (n=16). Chromite is Chr62.6±1.5Usp18±3Spl18±0.9 (n=3).

Classification: T. Shisseh, R. Hewins, FSAC, MNHNP) Polymict eucrite. This meteorite contains cumulate and basaltic fragments, and pyroxene with Fe/Mn ratios matching those of eucrites, plus typical eucritic textures.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir, Morocco
Mass (g):4.4
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):51±1 (n=14); 60±2 (n=8)
Wollastonite (mol%):2±0.4; 3±1.5
Classifier:T. Shisseh, FSAC; R. Hewins, B. Zanda, MNHNP
Type spec mass (g):0.88
Type spec location:MNHNP
Main mass:Luc Labenne meteorites
Comments:Submitted by T. Shisseh
   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)
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 22 Oct 2022)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Public domain photographs:
Shisseh Taha      


     This is 1 of 2003 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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