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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:help 10.4 g
Meteoritical Bulletin:  MB 107  (2018)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 151 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 23 Sep 2018
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 Fs38.7±3.8Wo6.9±2.0 (Fs30.6-42.7Wo5.0-10.2, N=8), FeO/MnO=23.0±3.4 (range 17.0 - 28.5). Plagioclase An95.9±0.1Ab4.0±0.1Or0.1±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:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2014
Mass (g):10.4
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:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Public domain photographs:
Jerome Gattacceca         

     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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