Meteoritical Bulletin: Entry for Northwest Africa 8027

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Northwest Africa 8027

Basic information

Name: Northwest Africa 8027
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8027
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 4.58 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 3 Jul 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8027 (NWA 8027)

(Northwest Africa)

Purchased: 2003

Classification: HED achondrite (Howardite)

Petrography: The sample is highly brecciated and consists of a diverse range of angular to sub-rounded gabbroic and diogenitic clasts set in a clastic, relatively coarse-grained matrix. Clast sizes vary from ~100 μm to ~2000 μm in the thin section studied and display a wide range of textures, including equigranular, spherulitic and micro-crystalline types. The matrix consists of angular grains up to ~100 μm diameter. The matrix is dominated by angular grains of plagioclase, orthopyroxene, pigeonite and subcalcic augite. Plagioclase in the sample is in the range An_79-93.Pyroxene in the sample is in the range Wo_1.1En_78.5Fs_20.4to Wo_24.1En_34.8Fs_41.1The sample contains greater than 10% magnesian orthopyroxene and is therefore a howardite based on the classification scheme of Delaney et al. (1983).

Geochemistry: The oxygen isotope composition of the sample is consistent with it being a member of the HED suite: δ¹⁷O = 1.68‰ δ¹⁸O = 3.68‰ Δ¹⁷O = -0.23‰

Bibliography:

Delaney J.S., Takeda H., Prinz M., Nehru C.E., and Harlow G.E. (1983) The nomenclature of polymict basaltic achondrites. Meteoritics 18 103-111. (link)

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Western Sahara
Date:	P 2003
Mass (g):	4.58
Pieces:	1
Class:	Howardite
Classifier:	R. Greenwood, OU
Type spec mass (g):	1.26
Type spec location:	OU
Main mass:	Michel Franco
Comments:	Submitted by Richard Greenwood

Plots:

O isotopes:

Institutions
and collections

OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)

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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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