Meteoritical Bulletin: Entry for Northwest Africa 13509

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Northwest Africa 13509

Basic information

Name: Northwest Africa 13509
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13509
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 1239 g

Classification
history:

Recommended:

LL4-6 [explanation]

This is 1 of 72 approved meteorites classified as LL4-6. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 2 Nov 2020

Writeup

Writeup from MB 109:

Northwest Africa 13509 (NWA 13509)

(Northwest Africa)

Purchased: 2018 Sep

Classification: Ordinary chondrite (LL4-6)

History: Purchased by John Higgins in September 2018 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh recrystallized breccia composed of Type 6 lithic clasts (containing rare remnant chondrules) plus large (up to 5 mm in diameter), well-formed, equilibrated discrete chondrules (Type 4) in a fine grained, highly recrystallized matrix containing troilite, pentlandite, taenite and chromite.

Geochemistry: Olivine (31.2±0.2, range Fa_30.9-31.5, N = 5), low-Ca pyroxene (Fs_25.4±0.1Wo_1.8±0.3, range Fs_25.3-25.6Wo_1.3-2.0, N = 5), augite (Fs_10.5±0.3Wo_43.7±0.3, range Fs_10.2-10.7Wo_43.5-44.1, N = 3).

Classification: Ordinary chondrite (LL4-6 breccia, highly recrystallized).

Specimens: 45 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2018 Sep
Mass (g):	1239
Pieces:	2
Class:	LL4-6
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	31.2±0.2
Ferrosilite (mol%):	25.4±0.1
Wollastonite (mol%):	1.8±0.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	45
Type spec location:	UWB
Main mass:	J. Higgins
Comments:	Work name JH20-5; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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