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Northwest Africa 12340
Basic information Name: Northwest Africa 12340
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12340
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 74 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12340 (NWA 12340)

(Northwest Africa)

Purchased: 2006 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France

Petrography: (K. Metzler, IfP) Polymict breccia consisting of eucritic lithic clasts with ophitic, subophitic and granulitic textures, and mineral fragments (eucritic and diogenitic pyroxene, plagioclase). Breccia-in breccia clasts and impact melt rock clasts are also present. These components are set in a fine-grained matrix of related debris, cemented by thin films of intergranular shock-melt. Most eucritic pyroxenes exhibit exsolution lamellae. Percentage of diogenitic components in the investigated sample is below 10 vol%. Accessories are silica polymorph, ilmenite, Cr-spinel, troilite, and metal. Secondary calcite occurs.

Geochemistry: Mineral compositions and geochemistry: Eucritic low-Ca pyroxene: Fs45.6±10.1Wo4.7±1.6 (Fs32-61Wo3-8); mean Fe/Mn (at.): 32; n=15. Eucritic Ca-rich pyroxene: Fs27.3±6.3Wo40.1±2.8 (Fs15-35Wo36-44; n=8). Diogenitic pyroxene: Fs26.1±1.8Wo3.3±0.5 (Fs23-29Wo2-4); mean Fe/Mn (at.): 33; n=8. Plagioclase An91.1±0.7Or0.2±0.2 (An90-92Or0-0.5); n=13.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2006 Jun
Mass (g):74
Pieces:2
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):45.6; 27.3
Wollastonite (mol%):4.7; 40.1
Classifier:K. Metzler, IfP
Type spec mass (g):15
Type spec location:IfP, Münster
Main mass:anonymous
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)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6846 approved meteorites from (Northwest Africa) (plus 2038 unapproved names)

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