Meteoritical Bulletin: Entry for Northwest Africa 12871

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Northwest Africa 12871

Basic information

Name: Northwest Africa 12871
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12871
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 198 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL3
Recommended:			LL3 [explanation]

This is 1 of 452 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 26 Sep 2019

Writeup

Writeup from MB 108:

Northwest Africa 12871 (NWA 12871)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (LL3)

History: Purchased in 2018 by Matthew Stream from Habib Naji Naji in Morocco.

Physical characteristics: Dark-brown stone containing weathering cracks throughout the fusion crust into the interior.

Petrography: (D. Sheikh, FSU) Sample contains abundant well-formed, closely packed chondrules (up to 2.5 mm, av. diameter 950 µm) in a dark matrix of fine-grained silicates, troilite, iron oxides, and rare iron-nickel metal.

Geochemistry: (D. Sheikh, FSU) Olivine (Fa_16.6±10.5, range Fa_0.8-33.2, n=25), Cr₂O₃ in ferroan olivine (0.07-0.35 wt%, mean 0.21±0.10, n=12), Orthopyroxene (Fs_9.5±6.2Wo_1.9±1.7, range Fs_2.4-21.0Wo_0.2-4.3, n=20).

Classification: Ordinary Chondrite (LL3)

Specimens: 20.08 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2018
Mass (g):	198
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	16.6±10.5 (0.8-33.2, n=25)
Ferrosilite (mol%):	9.5±6.2 (2.4-21.0, n=20)
Wollastonite (mol%):	1.9±1.7 (0.2-4.3, n=20)
Classifier:	D. Sheikh, FSU
Type spec mass (g):	20.08
Type spec location:	UCLA
Main mass:	Matthew Stream
Comments:	Submitted by Daniel Sheikh

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)

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
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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