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Northwest Africa 11815
Basic information Name: Northwest Africa 11815
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11815
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 279 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 462 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 16 Jun 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11815 (NWA 11815)

(Northwest Africa)

Purchased: 2017 Dec

Classification: Ureilite

History: Purchased from an Algerian mineral dealer.

Petrography: (K. Metzler, IfP) Coarse-grained ultramafic rock with aligned texture, consisting of olivine and pyroxene grains with sizes up to ~2.5 mm. Reverse zoning of olivine grains with Mg-rich zones at the margins and along cracks. Metal is concentrated along grain boundaries and mostly oxidized by terrestrial weathering.

Geochemistry: Mineral compositions and geochemistry: Olivine cores (n=9): Fa18.3±0.2; Olivine rims (n=6): Fa3.6±1.1; Pyroxene grains (n=14): Fs15.3±0.3Wo8.1±0.3. The mean concentration of Cr2O3 in olivine and pyroxene is 0.7 wt% and 1.2 wt%, respectively.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2017 Dec
Mass (g):279
Pieces:1
Class:Ureilite
Shock stage:moderate
Weathering grade:high
Fayalite (mol%):18.3±0.2; 3.6±1.1
Ferrosilite (mol%):15.3±0.3
Wollastonite (mol%):8.1±0.3.
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Manuel Nieto Sanchez, Albacete, Spain
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, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6324 approved meteorites from (Northwest Africa) (plus 2026 unapproved names)

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