Meteoritical Bulletin: Entry for Northwest Africa 12739

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Northwest Africa 12739

Basic information

Name: Northwest Africa 12739
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12739
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 91 g

Classification
history:

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

This is 1 of 545 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 27 Jul 2019

Writeup

Writeup from MB 108:

Northwest Africa 12739 (NWA 12739)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Diogenite)

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

Physical characteristics: Single stone partly covered by fusion crust.

Petrography: The meteorite is an achondritic breccia composed of two types of low-Ca pyroxene, olivine, and less abundant calcic feldspar. Minerals are up to 4 mm in size and embedded in fine-grained clastic matrix. Minor phases include silica, chromite, FeS, and metallic Fe.

Geochemistry: pyroxene: Fs_22.3.0±0.2Wo_1.4±0.1(Fs_22.0-22.6Wo_1.2-1.5, n=13, FeO/MnO=25-28); pyroxene: Fs_29.7±1.8Wo_2.8±0.3(Fs_28.1-33.9Wo_2.6-3.6, n=12, FeO/MnO=30-33); olivine: Fa_28.2±0.7(Fa_27.1-29.2, n=17, FeO/MnO=48±2); calcic plagioclase: An_90.7±0.4(An_90.0-91.1, n=16)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Zagora, Morocco
Date:	P 2019
Mass (g):	91
Pieces:	1
Class:	Diogenite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	28.2
Ferrosilite (mol%):	22.3; 29.7
Wollastonite (mol%):	1.4; 2.8
Classifier:	A. Greshake, MNB
Type spec mass (g):	18.2
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 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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