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Northwest Africa 11757
Basic information Name: Northwest Africa 11757
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11757
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 1600 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 572 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 26 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11757 (NWA 11757)

Morocco

Purchased: 2017 Sep

Classification: Ureilite

Petrography: (K. Metzler, IfP) Coarse-grained ultramafic rock with metamorphic texture (~120° triple junctions), consisting of olivine and pyroxene grains up to ~2 mm. Reverse zoning of olivine grains with Mg-rich zones at the margins and along cracks. Metal is concentrated along grain boundaries and partly oxidized by terrestrial weathering.

Geochemistry: Mineral compositions and geochemistry: Olivine cores (n=10): Fa21.0±0.6; Olivine rims (n=5): Fa1.4±0.1. Pyroxene grains (n=10): Fs18.0±0.3Wo7.2±0.2. The concentration of Cr2O3 in olivine and pyroxene is 0.5 wt% and 0.8 wt%, respectively.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Guelmim, Morocco
Date:P 2017 Sep
Mass (g):1600
Pieces:1
Class:Ureilite
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):21.0; 1.4
Ferrosilite (mol%):18.0
Wollastonite (mol%):7.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP, Münster
Main mass:Nourddine Azelmat, Morocco
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1617 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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