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Northwest Africa 11397
Basic information Name: Northwest Africa 11397
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11397
Observed fall: No
Year found: 2015
Country: Western Sahara
Mass:help 1027 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 295 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Aug 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11397 (NWA 11397)

Western Sahara

Find: Aug 2015

Classification: HED achondrite (Eucrite, polymict)

History: In July 2015, Hamid Maatallaa, collaborator of MCM, recovered five pieces of the meteorite, which were sent to MCM for study. After the first observations, a sample for analysis was sent to Dr. Llorca, who carried out the classification.

Physical characteristics: Fragile rocks, gray in color, partly covered by a darker crust.

Petrography: Breccia composed of disaggregated eucritic debris and some lithic eucrite clasts in a light matrix. Minerals include anorthite, pigeonite, augite, fayalite, silica polymorph, ilmenite, troilite and chromite. Minor Fe metal.

Geochemistry: Low-Ca pyroxene (Fs54.5±3.0Wo5.3±1.2, FeO/MnO=32-38, n=12), high-Ca pyroxene (Fs25.2±2.6Wo40.8±1.1, FeO/MnO=27-32, n=14); orthopyroxene host (Fs34.5±3.2Wo3.2±0.8, FeO/MnO=24-27, n=18), clinopyroxene exsolution lamella (Fs15.8±1.1Wo42.3±0.9, FeO/MnO=28-31, n=15), plagioclase (An90.3±3.3, n=22), fayalite (Fa92.2±2.0, FeO/MnO=41-42, n=11).

Classification: Eucrite, polymict.

Specimens: 20.4 g at UPC, and 15g in MCM. Javier Franco holds the main mass.

Data from:
  MB106
  Table 0
  Line 0:
Origin or pseudonym:Tirass, Dakhla
Date:Aug 2015
Mass (g):1027
Pieces:5
Class:Eucrite-pmict
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):92.2
Ferrosilite (mol%):54.5
Wollastonite (mol%):5.3
Classifier:J. Llorca, UPC
Type spec mass (g):20.4
Type spec location:UPC
Main mass:Javier Franco Meteorites collection (private)
Comments:Submitted by José García
Institutions
   and collections
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)
MCM: Museo Canario de Meteoritos Las Palmas de Gran Canaria, Spain (institutional address; updated 26 Nov 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 106, in preparation (2017)
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Photos:
CreditPhotos
Public domain photographs:
José García         
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 171 approved meteorites from Western Sahara (plus 18 unapproved names)

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