Meteoritical Bulletin: Entry for Northwest Africa 8183

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Northwest Africa 8183

Basic information

Name: Northwest Africa 8183
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8183
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 307 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL(L)3.2
Recommended:			LL(L)3.2 [explanation]

This is 1 of 2 approved meteorites classified as LL(L)3.2. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 30 Jan 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8183 (NWA 8183)

(Northwest Africa)

Purchased: 2013

Classification: Ordinary chondrite, LL(L)3.2

History: Purchased October 2013 from a Moroccan meteorite dealer in Erfoud.

Physical characteristics: Single stone, weathered black fusion crust, saw-cut reveals many densely packed chondrules set in an orange-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, many are porphyritic, apparent mean diameter 623±322 μm, n=22. Abundant opaque matrix, most chondrules with glass or mesostasis. Iron-nickel metal blebs, sulfide and chromite present.

Geochemistry: (C. Agee and N. Muttik, UNM) All chondrule olivine Fa_16.4±9.6, range Fa_0.4-36.4, n=42; ferroan chondrule olivine Fa_17.7±8.9, Fe/Mn=44±21, Cr₂O₃=0.16±0.09 wt%, CaO=0.14±0.07 wt%, n=37; chondrule low-Ca pyroxene Fs_10.7±7.6Wo_1.2±1.4, Fe/Mn=21±15, n=22.

Classification: Ordinary chondrite (LL3.2), type 3.2 based on ferroan olivine mean Cr₂O₃ content and sigma from Grossman and Brearley (2005), the ferroan olivine compositions are similar to Y-793596 (LL3.2) reported therein. Weathering grade W1.

Specimens: 21 g including a probe mount on deposit at UNM, Mendy Ouzillou and Adam Bates hold 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:
  MB103
  Table 0
  Line 0:

Date:	P 2013
Mass (g):	307
Pieces:	1
Class:	LL(L)3.2
Weathering grade:	W1
Fayalite (mol%):	16.4±9.6
Ferrosilite (mol%):	10.7±7.6
Wollastonite (mol%):	1.2±1.4
Classifier:	C. Agee, UNM
Type spec mass (g):	21
Type spec location:	UNM
Main mass:	Mendy Ouzillou and Adam Bates
Comments:	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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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