Meteoritical Bulletin: Entry for Northwest Africa 11916

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Northwest Africa 11916

Basic information

Name: Northwest Africa 11916
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11916
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 10.4 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Achondrite-ung
Recommended:			Achondrite-ung [explanation]

This is 1 of 128 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites

Comments:

Approved 23 Sep 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11916 (NWA 11916)

(Northwest Africa)

Purchased: 2014

Classification: Ungrouped achondrite

History: Bought by Luc Labenne in Agadir in 2014

Physical characteristics: A single brown weathered stone

Petrography: J. Gattacecca, B. Devouard, P. Rochette, CEREGE) Main minerals are finely exsolved, blocky pigeonite crystals, to 1.5 mm, set in plagioclase. Low-Ca pyroxene is found as small inclusions in pigeonite. Pigeonite shows reduction at grain rims and along cracks. Accessory silica, merrilite, troilite, FeNi metal. Metal and sulfides are finely dispersed in the silicates and finely interspersed.

Geochemistry: Pigeonite Fs_38.7±3.8Wo_6.9±2.0(Fs_30.6-42.7Wo_5.0-10.2, N=8), FeO/MnO=23.0±3.4 (range 17.0 - 28.5). Plagioclase An_95.9±0.1Ab_4.0±0.1Or_0.1±0.1(N=4). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of two acid-washed 1.5 mg aliquots of a powdered 55 mg bulk sample is δ¹⁷O=1.47‰, δ¹⁸O=3.68‰ , Δ¹⁷O=-0.46‰, and δ¹⁷O=1.71‰, δ¹⁸O=4.09‰ , Δ¹⁷O=-0.44‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.91.

Classification: Ungrouped achondrite. Oxygen isotopes and Ca-pyroxene composition set this achondrite apart from HED achondrites.

Specimens: 2.2 g at CEREGE. Main mass with Labenne

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2014
Mass (g):	10.4
Pieces:	1
Class:	Achondrite-ung
Weathering grade:	moderate
Ferrosilite (mol%):	38.7±3.8 (N=8)
Wollastonite (mol%):	6.9±2.0
Magnetic suscept.:	3.91
Classifier:	J. Gattacceca, H. Pourkhorsandi, CEREGE
Type spec mass (g):	2.2
Type spec location:	CEREGE
Main mass:	Labenne Luc
Finder:	Labenne Luc
Comments:	work name LL2015-9; submitted by J. Gattacceca

Plots:

O isotopes:

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Jerome Gattacceca

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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