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Northwest Africa 13087
Basic information Name: Northwest Africa 13087
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13087
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 350 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 383 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Feb 2020
Writeup from MB 109:

Northwest Africa 13087 (NWA 13087)

(Northwest Africa)

Purchased: March 2018

Classification: HED achondrite (Eucrite, polymict)

History: The main mass was purchased in March 2018 in Arfoud, Morocco, from the Bouhayek brothers by Société Astronomique de France (SAF) member Pascal Maugein, who was given the type specimen in November 2018.

Physical characteristics: Main mass fully covered by black, regmaglypted fusion crust

Petrography: (E. Jacquet, B. Doisneau, MNHNP). Breccia with ophitic/subophitic and more blocky textured pyroxene/plagioclase clasts, along with mineral clasts of same. Pyroxene is frequently zoned in the former, and otherwise often presents augite lamellae, sometimes folded. The clasts may also contain silica and ilmenite-troilite-silica-pyroxene symplectites. Opaque clasts,whether with cryptocrystalline (plagioclase-pyroxene, <10 µm) or glassy (eucritic major element composition) groundmasses, are likely impact melts (with olivine a common minor mineral). Ferroan hedenbergite-fayalite-silica (or K-feldspar) clasts such as those described by Barrat et al. (2012) in howardites occur. One curious 0.6 mm anorthite clast with round <60 µm nodules of equant <10 µm euhedral pyroxene, silica, plagioclase crystals.

Geochemistry: Mineral compositions and geochemistry: Pyroxene Fe/Mn=34±4. Plagioclase is An85.2±6.6Ab13.4±6.0Or1±0.9 (An72.2-97.5Ab1.1-19.2Or0.1-2.5, N=19). One coarse chromite (Al2O3 = 17-21 wt%, Cr2O3 = 43-46 wt%; N=3). Olivine Fa79.6±20.4 (Fa51.9-90.0, N=4).

Classification: Eucrite (polymict). Clasts correspond to eucrite mineralogy but are variable in texture, mineral chemistry and metamorphism, hence the polymict nature of the breccia. Pyroxene Fe/Mn is consistent with HED.

Specimens: 320 g (main mass, plus one thin section, with P. Maugein); 30 g (type specimen, plus one thin section)

Data from:
  Table 0
  Line 0:
Place of purchase:Arfoud
Date:P March 2018
Mass (g):350
Weathering grade:A
Ferrosilite (mol%):49.3±11.3 (28.2-77.2, N=32)
Wollastonite (mol%):19.3±12.0 (3.8-44.3, N=32)
Classifier:B. Doisneau, E. Jacquet, A. Jambon, MNHNP
Type spec mass (g):30
Type spec location:MNHNP.
Main mass:Pascal Maugein
Comments:Submitted by E. Jacquet
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8744 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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