Meteoritical Bulletin: Entry for Northwest Africa 13434

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Northwest Africa 13434

Basic information

Name: Northwest Africa 13434
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13434
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 123.7 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2021)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 115 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 2 Nov 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13434 (NWA 13434)

(Northwest Africa)

Purchased: 2020 February

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was purchased from a Morrocan dealer at the mineral show in Munich, Germany.

Physical characteristics: Dark grayish rock without fusion crust.

Petrography: The meteorite is a melt breccia predominantly composed of large up to 700 µm sized exsolved pyroxene grains set into a feldspar-dominated matrix. Pyroxenes are partly to completely recrystallized and often display mottled compositional zoning. In recrystallized regions feldspar typically shows fibrous textures indicative for crystallization from a melt. No lithic clasts have been found. Minor phases include silica, chromite, FeS, and zircon. No metallic iron has been found. Some regions show brownish staining due to terrestrial weathering; secondary barite is present.

Geochemistry: low-Ca pyroxene: Fs_57.6±1.8Wo_4.1±1.6(Fs_55.0-60.4Wo_1.9-6.6, n=17, FeO/MnO=27-31); Ca-pyroxene: Fs_25.6±0.6Wo_43.7±0.6(Fs_24.9-27.2Wo_41.6-44.4, n=18, FeO/MnO=26-34); calcic plagioclase: An_93.0±0.7(An_91.8-94.2, n=14)

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Munich, Germany
Date:	P 2020 February
Mass (g):	123.7
Pieces:	1
Class:	Eucrite-melt breccia
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	57.6; 25.6
Wollastonite (mol%):	4.1; 43.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.7
Type spec location:	MNB
Main mass:	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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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