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Northwest Africa 14985 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 14985 This is an OFFICIAL meteorite name. Abbreviation: NWA 14985 Observed fall: No Year found: 2021 Country: (Northwest Africa) Mass: 99 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 60 approved meteorites classified as Diogenite-pm. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 14 Sep 2022 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 14985 (NWA 14985) (Northwest Africa) Purchased: Sept 2021 Classification: HED achondrite (Diogenite, polymict) History: Purchased by Ziyao Wang from a dealer in Algeria, Sept 2021 Petrography: The minerals in the meteorite include 100-500 ?m orthopyroxene (~80 vol.%), fine grained pigeonite (<10%) in the matrix, weakly zoned olivine (~5%), zoned magnesian olivine (~5%), and calcic plagioclase. Accessory minerals include augite, Ti-poor chromite, ilmenite, troilite, and kamacite. Most minerals display regular shape, but plagioclases and pyroxenes are irregular or barred in some clasts. There are ultrafine and irregular grains along the boundary of the clasts. Several orthopyroxenes are weakly zoned. There is exsolution augite lamellae in pigeonite. Some cracks are filled with barite, and some kamacite and troilite are oxidized, indicating that the meteorite is strongly weathered. Geochemistry: Orthopyroxene: Fs26.8±8.3Wo2.8±1.1 (n=9), Fe/Mn: 31.1±4.2; pigeonite: Fs49.3±6.3Wo10.1±1.6 (n=8), Fe/Mn: 31.2±1.7; augite: Fs28.4±1.4Wo45.0±1.1 (n=2), Fe/Mn: 32.6±0.6; weakly zoned olivine: Fa33.3±4.7 (n=6), Fe/Mn: 50.5±2.7; zoned magnesian olivine: Fa16.3±1.6 (n=6), Fe/Mn: 41.9±2.7; calcic plagioclase: An94.0±2.2 (n=8). Classification: Diogenite (polymict breccia). The classification is based on the Fe/Mn of pyroxenes, the abundance of olivine, the low TiO2 content in chromite, and the structure. Classification as a polymict type is based on the existence of pigeonite and augite (<10 vol.%). Specimens: 19.8g and a polished thick sections at CUG; Ziyao Wang holds the main mass | ||||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Institutions and collections |
CUG: Planetary Science Institute, School of Earth Sciences
China University of Geosciences (Wuhan)
388 Lumo Road, Wuhan, Hubei 430074, P. R. China, China (institutional address; updated 4 Feb 2019) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos: |
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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