Meteoritical Bulletin: Entry for Northwest Africa 8685

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Northwest Africa 8685

Basic information

Name: Northwest Africa 8685
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8685
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 340 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 13 Dec 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8685 (NWA 8685)

(Northwest Africa)

Purchased: 2014

Classification: Primitive achondrite (Acapulcoite)

History: Purchased by Aziz Habibi in Morocco, 2014.

Physical characteristics: Single stone with dark brown, weathered fusion crust, broken surface reveals dark, very fine, shiny, grains.

Petrography: (C. Agee, UNM) Microprobe examination of a polished epoxy mount shows of the silicate fraction: ~85% olivine, ~5% pyroxene, ~5% plagioclase. Accessory apatite and troilite. Metal (kamacite and taenite) make up approximately 15% of this meteorite. Olivine and pyroxene grain size ranges from ~50-300 μm.

Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Olivine Fa_10.2±0.1, Fe/Mn=21±1, n=7; low-Ca pyroxene Fs_10.0±0.1Wo_1.7?0.1, Fe/Mn=13±0, n=9; plagioclase Ab_80.4±0.8An_14.9±0.4Or_4.6±0.5, n=3. Oxygen Isotopes, laser fluorination (K. Ziegler, UNM), analyses on 3 acid-washed aliquots, 1.6, 1.7, 2.1 mg, gave values δ¹⁷O=0.898, 1.025, 0.759, δ¹⁸O=3.841, 3.932, 3.536, Δ¹⁷O=-1.130, -1.051, -1.108 (linearized, all permil).

Classification: Primitive Achondrite (Acapulcoite), moderately weathered.

Specimens: 22.5 g including microprobe mount on deposit UNM, Aziz Habibi holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2014
Mass (g):	340
Pieces:	1
Class:	Acapulcoite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	10.2±0.1
Ferrosilite (mol%):	10.0±0.1
Wollastonite (mol%):	1.7±0.1
Classifier:	C. Agee, UNM
Type spec mass (g):	22.5
Type spec location:	UNM
Main mass:	Aziz Habibi
Comments:	Submitted by C. Agee

Plots:

O isotopes:

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)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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