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Northwest Africa 12280
Basic information Name: Northwest Africa 12280
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12280
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 79 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 190 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12280 (NWA 12280)

Tindouf, Algeria

Find: 2016 Oct 10

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased in Denver USA by Zhouping Guo and Guobing Zhong on September, 2017 from Adam Aaronson.

Physical characteristics: A single bulk specimen, no fusion crust. Coarse-grained absinthe-green minerals can be observed. Weathering is strong.

Petrography: This meteorite is composed of a moderate-grained (20-100 µm) assemblage of pyroxene (38 vol%), olivine (51 vol%), maskelynite (7 vol%) and minor opaque minerals such as ilmenite, chromite and spinel. Maskelynite appears to be injected between pyroxene and olivine crysts.

Geochemistry (JK. Zhou, HY. Chen, ZP. Xia GUT): olivine: Fa35.2-37.3 (n=42), Fe/Mn(mol)=48.3-53.3 (n=42) ; pigeonite: Fs18.8-28.2Wo6.50-15.4En56.8-68.6, Fe/Mn(mol)=24.5-30.0, Mg#=67.1-73.8 (n=15); augite: Fs13.9-20.4Wo26.4-43.3En42.8-53.3, Fe/Mn(mol)=23.6-30.0, Mg#=70.9-73.3 (n=20); Maskelynite: An49.5-59.9Or2.29-3.62Ab36.9-46.9 (n=17); Spinel: MgO, 2.85%-4.15%; Al2O3, 4.08%-7.17%; TiO2,12.6%-19.6%; Cr2O3,20.1%-31.7%; FeO,44.3%-52.8%.

Classification: Martian (shergottite)

Specimens: 18.5 g including one polished thin section are deposited in GUT; Remaining material 60.5 g with Guobing Zhong and Zhouping Guo.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Tindouf
Origin or pseudonym:Tindouf Hamada in the Western Sahara
Place of purchase:Denver, USA
Date:2016 Oct 10
Mass (g):79
Pieces:1
Class:Martian (shergottite)
Classifier:H. Chen, J. Zhou, Z.Xia, GUT
Type spec mass (g):18.5
Type spec location:GUT
Main mass:Guobing Zhong
Comments:Submitted by Bingkui Miao
Institutions
   and collections
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Zhipeng Xia      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 32 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 970 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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