Meteoritical Bulletin: Entry for Northwest Africa 14170

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Northwest Africa 14170

Basic information

Name: Northwest Africa 14170
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14170
Observed fall: No
Year found: 2019
Country: Niger
Mass: 141 g

Classification
history:

Recommended:

LL7 [explanation]

This is 1 of 84 approved meteorites classified as LL7. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 6 Oct 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 14170 (NWA 14170)

Niger

Purchased: 2019 Nov

Classification: Ordinary chondrite (LL7)

History: Purchased by Mbark Arjdal in November 2019 from a dealer in Niger.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen retains original breccia structure, but both lithic clasts and sparse matrix have been recrystallized into an overall poikiloblastic texture characterized by olivine chadacrysts within low-Ca pyroxene oikocrysts. No trace of original chondrules remains. Accessory phases include sodic plagioclase, augite, taenite, kamacite, troilite, Ti-chromite, K-feldspar, chlorapatite and merrillite.

Geochemistry: Olivine (Fa_30.1±0.3, range Fa_29.9-30.6, N = 5), low-Ca pyroxene (Fs_24.2±0.4Wo_3.9±0.5, range Fs_23.6-24.6Wo_3.3-4.4, N = 4), augite (Fs_11.8±1.2Wo_40.5±2.2, range Fs_10.6-13.2Wo_37.7-42.6, N = 4), plagioclase (Ab_78.6-85.7An_20.0-11.9Or_1.4-2.4, N = 3), K-feldspar (Or_84.2Ab_11.4An_4.5).

Classification: Ordinary chondrite (LL7 breccia, poikiloblastic).

Specimens: 20.2 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Niger
Date:	P 2019 Nov
Mass (g):	141
Pieces:	1
Class:	LL7
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	30.1±0.3
Ferrosilite (mol%):	24.2±0.4
Wollastonite (mol%):	3.9±0.5
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	20.2
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj ZM 654; 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. 110, in preparation (2021)

Find references in NASA ADS:
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Geography:

Niger

Niger

Coordinates:

Unknown.

Statistics:
This is 1 of 93 approved meteorites from Niger (plus 4 unapproved names)

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