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Northwest Africa 14500 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 14500 This is an OFFICIAL meteorite name. Abbreviation: NWA 14500 Observed fall: No Year found: 2021 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 140 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 19 Feb 2022 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 14500 (NWA 14500) (Northwest Africa) Purchased: March 2021 Classification: Ungrouped achondrite Petrography: (J. Gattacceca, CEREGE) Metamorphic rock with granoblastic texture. Mineralogy: orthopyroxene and olivine grains with typical size 1.2 mm (63 vol%), plagioclase with grain size 400 µm (15 vol%), contorted metal grains to several mm (20 vol%), and troilite (3.5 vol%). Modal abundances are by point counting (n=256). Some olivine and pyroxene grains are poikilitically enclosed in plagioclase. Accessory chromite. No relict chondrules have been observed. Geochemistry: Olivine Fa23.7±0.8, FeO/MnO 50.6 (n=4). Orthopyroxene Fs20.4±0.4Wo3.5±0.4, FeO/MnO = 33.3±4.1 (n=6). Plagioclase An0.0±0.0Ab95.0±0.2Or5.0±0.2 (n=4). Oxygen isotopic composition (J, Gattacceca, C, Sonzogni, CEREGE) from analysis of one 1.5 mg aliquot of a powdered 266 mg bulk sample treated using ethanolamine-thioglycollate (EATG) and magnetic extraction of metal is δ17O=1.22‰, δ18O=4.63‰ , Δ17O=-1.19‰ (slope 0.52, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Classification: Achondrite, ungrouped. While the mineralogy and mineral chemistry are similar to that of L chondrites, the O-isotope compositions and the metal content (20 vol%) rule out a relationship with the L chondrites. Specimens: Type specimen at CEREGE. Main mass with Kuntz. | ||||||||||||||||||||||||||||||||
Data from: MB111 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) Kuntz: Fabien Kuntz, France; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |