Meteoritical Bulletin: Entry for Northwest Africa 12740

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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: 61.7 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 27 Jul 2019

Writeup

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: Fs_59.2±1.1Wo_4.0±0.7(Fs_57.7-61.0Wo_3.0-4.9, n=11, FeO/MnO=30-36); Ca-pyroxene: Fs_32.4±3.8Wo_37.4±4.3(Fs_29.1-41.2Wo_27.1-41.1, n=13, FeO/MnO=31-35); calcic plagioclase: An_88.4±2.3(An_84.5-92.5, 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; updated 24 Dec 2011)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Ryan Upchurch

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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