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Northwest Africa 11742
Basic information Name: Northwest Africa 11742
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11742
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 650 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 17 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11742 (NWA 11742)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was bought from a local meteorite dealer in Quarzazate, Morocco.

Physical characteristics: Brownish individual without fusion crust.

Petrography: The meteorite is a melt breccia composed of up to 5 mm sized basaltic clasts set into shock melted matrix. Basaltic clasts consist of exsolved pyroxenes and often lath shaped calcic plagioclase. The shock melt is mostly recrystallized to plagioclase and pyroxene; some regions show pronounced flow textures. Minor phases include silica, chromite, ilmenite and barite.

Geochemistry: low-Ca pyroxene: Fs59.9±0.9Wo4.0±1.3 (Fs57.4-61.1Wo2.2-7.6, n=14, FeO/MnO=33-37); Ca-pyroxene: Fs27.8±1.2Wo42.1±1.2 (Fs26.2-30.1Wo39.7-43.8, n=16, FeO/MnO=33-39); calcic plagioclase: An90.6±0.8 (An89.3-91.9, n=16)

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Quarzazate, Morocco,
Date:P 2016
Mass (g):650
Pieces:1
Class:Eucrite-melt breccia
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):59.9; 27.8
Wollastonite (mol%):4.0; 42.1
Classifier:A. Greshake, MNB
Type spec mass (g):24.4
Type spec location:MNB
Main mass:Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6365 approved meteorites from (Northwest Africa) (plus 2024 unapproved names)

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