Meteoritical Bulletin: Entry for Northwest Africa 8679

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Northwest Africa 8679

Basic information

Name: Northwest Africa 8679
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8679
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 285 g

Classification
history:

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

This is 1 of 293 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 12 Dec 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8679 (NWA 8679)

(Northwest Africa)

Purchased: 2014 Sep

Classification: Martian meteorite (Shergottite)

History: Purchased by Dr. David Gregory in September 2014 from a Moroccan dealer at the Denver Show.

Physical characteristics: (I. Nicklin and K. Tait, ROM) Ellipsoidal stone (285 g) partly covered by black fusion crust. Wire-saw cutting revealed the fresh, gray interior, which is relatively fine-grained with visible glassy maskelynite.

Petrography: (A. Irving and S. Kuehner, UWS) Intersertal texture. Composed predominantly of prismatic grains (up to 1.8 mm long) of clinopyroxene (exhibiting complex, patchy compositional zoning) and lath-shaped grains (up to 1.2 mm long) of maskelynite, with accessory ulvöspinel, ilmenite, pyrrhotite and rare merrillite.

Geochemistry: (S. Kuehner and A. Irving, UWS) Subcalcic augite (Fs_21.1-37.2Wo_31.6-33.9, FeO/MnO = 28-37, N = 8), pigeonite (Fs_29.9-59.7Wo_9.8-16.9, FeO/MnO = 32-38, N = 12), plagioclase (maskelynite) (An_47.9-54.1Or_1.5-1.3, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of four acid-washed subsamples by laser fluorination gave, respectively, δ¹⁷O 2.742, 2.896, 2.845, 2.642; δ¹⁸O 4.680, 4.974, 4.934, 4.562; Δ¹⁷O 0.271, 0.270, 0.240, 0.233 (all values in per mil).

Classification: Martian (shergottite).

Specimens: 23 g plus one polished thin section, one polished thick section and a polished epoxy mount at ROM. The remainder is held by DGregory.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Denver
Date:	P 2014 Sep
Mass (g):	285
Pieces:	1
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	21.1-37.2; 29.9-59.7
Wollastonite (mol%):	31.6-33.9; 9.8-16.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	23
Type spec location:	ROM
Main mass:	DGregory
Comments:	DGR 008-14; submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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. 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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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