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Northwest Africa 12740
Basic information Name: Northwest Africa 12740
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12740
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 61.7 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 429 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12740 (NWA 12740)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a local meteorite dealer in Zagora, Morocco.

Physical characteristics: Single stone with fusion crust.

Petrography: The meteorite is a fragmental breccia composed of fine- and coarse-grained basaltic fragments set into a clastic mineral matrix dominated by exsolved pyroxene and calcic plagioclase with grain sizes ranging from about 30 to 500 μm. Some pyroxenes show a weak compositional zoning. Minor phases include silica, chromite, FeS, ilmenite, fayalite, and metallic Fe.

Geochemistry: low-Ca pyroxene: Fs59.2±1.1Wo4.0±0.7 (Fs57.7-61.0Wo3.0-4.9, n=11, FeO/MnO=30-36); Ca-pyroxene: Fs32.4±3.8Wo37.4±4.3 (Fs29.1-41.2Wo27.1-41.1, n=13, FeO/MnO=31-35); calcic plagioclase: An88.4±2.3 (An84.5-92.5, n=10)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P 2019
Mass (g):61.7
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.2; 32.4
Wollastonite (mol%):4.0; 37.4
Classifier:A. Greshake, MNB
Type spec mass (g):13.5
Type spec location:MNB
Main mass:Fabien Kuntz
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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