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Northwest Africa 14988 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 14988 This is an OFFICIAL meteorite name. Abbreviation: NWA 14988 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 85 approved meteorites (plus 1 unapproved name) classified as Winonaite. [show all] Search for other: Primitive achondrites, Winonaites | ||||||||||||||||||||||||||||||
Comments: | Approved 20 Dec 2022 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 14988 (NWA 14988) (Northwest Africa) Purchased: 2019 Classification: Primitive achondrite (Winonaite) History: Purchased by Ziyao Wang in April 2019 from Saeed Haddany in Erfoud, Morocco. Physical characteristics: Single stone. Orange-brown weathered exterior. Saw cut reveals a fine-grained texture of silicates and oxidized iron patches. Petrography: (A. Ross and C. Agee, UNM) Microprobe and reflected light microscope examination of a polished mount shows a texturally equilibrated mosaic of enstatite and diopside with grain size in the range 100-300 μm, many triple junctions are present. Nearly all of the primary metal has been oxidized. No feldspar was observed in the microprobe mount. Geochemistry: (A. Ross, UNM) Olivine Fa2.4±0.5, Fe/M=10±2, n=6; enstatite Fs3.1±0.0Wo1.1±0.1, Fe/Mn=8±0, n=3; diopside Fs1.2±0.0Wo47.3±0.3, Fe/Mn=6±1, n=3; plagioclase Ab81.7±1.4An14.8±2.0, n=4. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 4.959; 5.390; 4.856; δ17O= 2.044, 2.291, 2.021; Δ17O= -0.574, -0.555, -0.543 (linearized, all per mil, TFL slope=0.528). Classification: Primitive achondrite (Winonaite) based on oxygen isotopes which plot in the winonaite field; also based on the very magnesian olivines and pyroxenes with low Fe/Mn values. Specimens: 21.4 g including a probe mount on deposit at UNM, WangZ holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021) |
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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) |