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Northwest Africa 11916 | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 138 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 23 Sep 2018 | ||||||||||||||||||||||||||||||
Writeup![]() |
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: MB107 Table 0 Line 0: |
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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 10 Jun 2023) Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names) |