Meteoritical Bulletin: Entry for Northwest Africa 8706

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Northwest Africa 8706

Basic information

Name: Northwest Africa 8706
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8706
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 103 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 28 Dec 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8706 (NWA 8706)

Morocco

Purchased: Oct. 2012

Classification: Primitive achondrite (Acapulcoite)

History: Purchased by S. Kawakami in Erfoud, Morocco, in Oct. 2012

Physical characteristics: Two weathered stones of 103 g (75 g and 28 g), partly covered with rusted brown fusion crust

Petrography: (T. Mikouchi, UTok and S. Kawakami, Gifu University). Equigranular texture, consisting largely of olivine and pyroxene with minor plagioclase, Fe-Ni metal, and troilite. Some large pyroxene oikocrysts contain small olivine chadacrysts. Blocky olivine grains are 0.2 mm in average size. Mineral abundances (vol%) are 39.8 low-Ca pyroxene, 39.5 olivine,7.0 high-Ca pyroxene, 8.0 plagioclase, 5.7 Fe-Ni metal, and <0.1% of apatite

Geochemistry: (T. Mikouhi, UTok and S. Kawakami, Gifu University). The silicate compositions cluster tightly near: low-Ca pyroxene, Fs_11.8±0.3Wo_2.2±0.2with FeO/MnO=14.1; olivine Fa_11.9±2.5; high-Ca pyroxene, Fs_4.9±0.4Wo_44.4±0.6; plagioclase, An_22.3±1.1Or_2.6±0.2.

Classification: Acapulcoite

Specimens: 20.9 g at UTok. Main mass with S. Kawakami

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P Oct. 2012
Mass (g):	103
Pieces:	2
Class:	Acapulcoite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	9.4-14.4
Ferrosilite (mol%):	4.5-5.3 (low-Ca px), 11.5-12.1 (for high-Ca px)
Wollastonite (mol%):	2.0-2.4 (low-Ca px), 43.8-45.0 (high-Ca px)
Classifier:	T. Mikouchi and S. Kawakami, UTok
Type spec mass (g):	20.9
Type spec location:	UTok
Main mass:	S. Kawakami
Comments:	Submitted by T. Mikouchi

Institutions
and collections

UTok: University Museum, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (institutional address; updated 3 Oct 2021)

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:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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