Meteoritical Bulletin: Entry for Northwest Africa 11742

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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: 650 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 97 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 7 Apr 2018

Writeup

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: Fs_59.9±0.9Wo_4.0±1.3(Fs_57.4-61.1Wo_2.2-7.6, n=14, FeO/MnO=33-37); Ca-pyroxene: Fs_27.8±1.2Wo_42.1±1.2(Fs_26.2-30.1Wo_39.7-43.8, n=16, FeO/MnO=33-39); calcic plagioclase: An_90.6±0.8(An_89.3-91.9, 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; updated 24 Dec 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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