Meteoritical Bulletin: Entry for Northwest Africa 5885

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Northwest Africa 5885

Basic information

Name: Northwest Africa 5885
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5885
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 98 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Aubrite
Recommended:			Aubrite [explanation]

This is 1 of 83 approved meteorites classified as Aubrite. [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites

Comments:

Approved 31 Jul 2017

Writeup

Writeup from MB 106:

Northwest Africa 5885 (NWA 5885)

(Northwest Africa)

Purchased: 2009

Classification: Enstatite achondrite (Aubrite)

History: The meteorite was bought in 2009 from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: A single, brownish individual without fusion crust was purchased.

Petrography: The meteorite displays a medium- to coarse-grained texture dominantly composed of up to 2 mm sized enstatite crystals. Often, adjoining grains show triple junctions. Less abundant are albitic feldspar and kamacite. Perryite is found as exsolution phase in the metal. The meteorite contains several weathering veins.

Geochemistry: Feldspar: An_4.1Ab_91.7Or_4.2(N=2); metal contains 3.2-3.8 wt Ni and about 3.2 wt% Si; oxygen isotopes (N. Assayag, P. Cartigny, and D. Rumble, IPGP): δ¹⁸O=5.335, 5.585; δ¹⁷O=2.849, 2.875; Δ¹⁷O= 0.057, -0.048 (all per mil).

Classification: Aubrite. Pairing with NWA 6675 seems likely.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2009
Mass (g):	98
Pieces:	1
Class:	Aubrite
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	0.5±0.2 (0.1-0.9, n=17)
Wollastonite (mol%):	0.3±0.04 (0.3-0.4, n=17)
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.2
Type spec location:	MNB
Main mass:	Fabien Kuntz
Comments:	Submitted by Ansgar Greshake

Plots:

O isotopes:

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
IPGP: Institute de Physique du Globe de Paris, 1 rue Jussieu, 75252 Paris, Cedex 05, France (institutional address; updated 3 Nov 2014)
Kuntz: Fabien Kuntz, France; Website (private address)

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.

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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