Meteoritical Bulletin: Entry for Northwest Africa 11574

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Northwest Africa 11574

Basic information

Name: Northwest Africa 11574
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11574
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 750 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	L3.10
Recommended:			L3.10 [explanation]

This is 1 of 8 approved meteorites classified as L3.10. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 17 Jan 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11574 (NWA 11574)

(Northwest Africa)

Purchased: 2017

Classification: Ordinary chondrite (L3.10)

History: Purchased by Marcin Cimała in Morocco, 2017.

Physical characteristics: Single stone with weathered exterior, saw cuts shows many densely packed chondrules set in a dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, most with mesostasis or glass. Adundant opaque matrix. Apparent mean chondrule diameter 700±390 μm, n=31, consistent with L.

Geochemistry: (C. Agee, UNM) All olivine Fa_16.4±12.5, Fe/Mn=50±25, n=40; Ferroan chondrule olivine Fa_19.7±11.3, Fe/Mn=55±23, Cr₂O₃=0.21±0.21 (wt%), n=33; low-Ca pyroxene Fs_13.0±10.6Wo_1.8±1.9, n=13.

Classification: Ordinary chondrite (L3.10), type 3.10 based on mean value of Cr₂O₃ in ferroan chondrule olivine and the 1-sigma standard deviation, near the boundary between 3.10 and 3.15 in figure 13 (Grossman and Brearley, 2005), however closest to values of Adrar 003 (L/LL3.10) with Cr₂O₃=0.23±0.21 (n=47).

Specimens: 29 g including a probe mount on deposit at UNM, Marcin Cimała holds the main mass.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2017
Mass (g):	750
Pieces:	1
Class:	L3.10
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	16.4±12.5
Ferrosilite (mol%):	13.0±10.6
Wollastonite (mol%):	1.8±1.9
Classifier:	C. Agee, UNM
Type spec mass (g):	29
Type spec location:	UNM
Main mass:	Marcin Cimala
Comments:	Field name MC 150; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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