Meteoritical Bulletin: Entry for Northwest Africa 10388

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Northwest Africa 10388

Basic information

Name: Northwest Africa 10388
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10388
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 158.7 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 443 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 10 Dec 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10388 (NWA 10388)

(Northwest Africa)

Purchased: 2010 Feb

Classification: HED achondrite (Diogenite)

History: Purchased by Dr. David Gregory in February 2010 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen composed predominantly of interleaved, bladed grains of orthopyroxene (72.2 vol.%) and calcic plagioclase (25.1 vol.%) exhibiting strong lattice preferred orientation. Some larger (up to 4 mm), equant grains of orthopyroxene are also present. Accessory minerals are olivine, Ti-bearing chromite, Ti-free and Al-bearing chromite, rare silica polymorph and troilite.

Geochemistry: Orthopyroxene (cores Fs_22.3-24.9Wo_1.8-3.0; rims Fs_30.9-34.9Wo_4.1-3.2; FeO/MnO = 29-33; N = 4), olivine (Fa_33.7-37.0, FeO/MnO = 43-47, N = 2), olivine inclusion in large orthopyroxene grain (Fa_26.7, FeO/MnO = 39), plagioclase (An_85.9-88.0Or_0.1-0.3, N = 3).

Classification: Diogenite (noritic). The plagioclase abundance (25 vol%) is anomalous for a diogenite.

Specimens: 26.71 g including one polished thin section at ROM; remainder with DGregory.

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2010 Feb
Mass (g):	158.68
Pieces:	2
Class:	Diogenite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	26.7; 33.7-37.0
Ferrosilite (mol%):	22.3-24.9
Wollastonite (mol%):	1.8-3.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	26.71
Type spec location:	ROM
Main mass:	DGregory
Comments:	ROM 066; submitted by A. Irving

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Volker Heinrich

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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