Meteoritical Bulletin: Entry for Northwest Africa 10859

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Northwest Africa 10859

Basic information

Name: Northwest Africa 10859
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10859
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 215 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Achondrite-ung
Recommended:			Achondrite-ung [explanation]

This is 1 of 88 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites

Comments:

Approved 14 Mar 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 10859 (NWA 10859)

(Northwest Africa)

Purchased: 2016 May

Classification: Ungrouped achondrite

History: Purportedly found near Tan Tan, Morocco, and purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco.

Physical characteristics: A group of small , dark reddish-brown stones, mostly lacking fusion crust (total weight 215 g). Fresh interiors are gray with tiny grains of visible shiny metal.

Petrography: (A. Irving and S. Kuehner, UWS) Triple grain junction texture. Grainsize mostly 0.1-0.2 mm, but some larger grains up to 0.4 mm. Minerals are olivine, clinopyroxene, intermediate plagioclase, troilite, chromite, kamacite and taenite.

Geochemistry: Olivine (Fa_31.8-31.9, FeO/MnO = 75-77, N = 3), clinopyroxene (Fs_11.4-11.5Wo_43.6-43.4, FeO/MnO = 37-40, N = 3). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ¹⁷O -3.706, -3.702, -3.634, -3.817; δ¹⁸O -0.567, -0.835, -0.737, -0.943; Δ¹⁷O -3.407, -3.261, -3.245, -3.319 per mil.

Classification: Ungrouped achondrite, paired with NWA 10503.

Specimens: 20.2 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2016 May
Mass (g):	215
Pieces:	many
Class:	Achondrite-ung
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	31.8-31.9
Ferrosilite (mol%):	11.4-11.5
Wollastonite (mol%):	43.6-43.4
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.2
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	BH010; submitted by A. Irving

Plots:

O isotopes:

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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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