Meteoritical Bulletin: Entry for Northwest Africa 8188

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Northwest Africa 8188

Basic information

Name: Northwest Africa 8188
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8188
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 123.7 g

Classification
history:

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

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 12 Feb 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8188 (NWA 8188)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Howardite)

History: Purchased by Jack Schrader from a meteorite dealer in Erfoud, Morocco, 2013.

Physical characteristics: 37 pieces, irregular surface, weathered exterior, saw cut reveals fine-grained dark gray matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a fragmental breccia with multiple lithologies and a significant amount of shock melt. Fragmental pyroxene, plagioclase, and basaltic clasts range from sub-micron to 200 μm, many domains appear cataclastic. Equilibrated pyroxenes with exolution lamellae are present as are pyroxenes with igneous zoning. One population of pyroxenes is diogenitic, while two other populations are consistent with equilibrated basaltic eucrite and unequilibrated eucrite. Ubiquitous silica and ilmenite.

Geochemistry: (C. Agee and H. Miley, UNM) Diogenite pyroxene Fs_23.4±3.8Wo_1.8±0.4, Fe/Mn=32±3, n=9; unequilibrated eucrite pyroxene Fs_40.1±8.2Wo_4.5±1.4, Fe/Mn=30±2, n=12; basaltic eucrite pyroxene Fs_50.4±5.9Wo_13.1±7.7, Fe/Mn=33±2, n=12; plagioclase Or_1.1±0.7Ab_8.8±1.8An_90.1±1.9, n=4.

Classification: Howardite based on the presence of approximately 25% diogenitic and 75% eucritic material.

Specimens: 20.0 g including a probe mount on deposit at UNM, Jack Schrader holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013
Mass (g):	123.7
Pieces:	37
Class:	Howardite
Shock stage:	high
Weathering grade:	medium
Classifier:	C. Agee, UNM
Type spec mass (g):	20.0
Type spec location:	UNM
Main mass:	Jack Schrader
Comments:	Field name JLS-2; 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)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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