Meteoritical Bulletin: Entry for Northwest Africa 8580

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Northwest Africa 8580

Basic information

Name: Northwest Africa 8580
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8580
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 102 g

Classification
history:

Recommended:

L3.15 [explanation]

This is 1 of 9 approved meteorites classified as L3.15. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 1 Jan 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 8580 (NWA 8580)

(Northwest Africa)

Purchased: 2014 Jun 25

Classification: Ordinary chondrite (L3.15)

History: Purchased from a Moroccan mineral dealer at the mineral show in Sainte-Marie-aux-Mines, France

Petrography: (K. Metzler, IfP) Ordinary chondrite of low petrologic type consisting of closely packed chondrules with very low amounts of interchondrule matrix. The mean apparent chondrule size is 490 µm (140-1970 µm; n=223). Accessory phases are Fe,Ni metal and troilite, mostly residing outside of chondrules.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa_17.8±12.7(0.5-47.9; n=36); the mean low-Ca pyroxene composition is Fs_7.7±6.9Wo_0.9±1.1(Fs_0.7-27.5Wo_0.1-5.2; n=28). The ferroan olivine mean value of Cr₂O₃ and 1-sigma standard deviation is 0.19±0.13 (n=44), similar to Y-791324 (LL3.15; Grossman and Brearley, 2005).

Classification: L chondrite, based on the mean chondrule size. Petrologic type 3.15 based on 1-sigma standard deviation of Fa and Fs, and on the ferroan olivine mean value of Cr₂O₃ and 1-sigma standard deviation.

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:
  MB109
  Table 0
  Line 0:

Place of purchase:	Sainte-Marie-aux-Mines, France
Date:	P 2014 Jun 25
Mass (g):	102
Pieces:	1
Class:	L3.15
Shock stage:	S3
Weathering grade:	W1
Fayalite (mol%):	17.8±12.7
Ferrosilite (mol%):	7.7±6.9
Wollastonite (mol%):	0.9±1.1
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Anonymous
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

Catalogs:

References:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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