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Northwest Africa 14988
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:help 384 g
Classification
  history:
Recommended:  Winonaite    [explanation]

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
Writeuphelp
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:
Place of purchase:Morocco
Date:P 2019
Mass (g):383.7
Pieces:1
Class:Winonaite
Shock stage:low
Weathering grade:high
Fayalite (mol%):2.4±0.5
Ferrosilite (mol%):3.1±0.0, 1.2±0.0
Wollastonite (mol%):1.1±0.1, 47.3±0.3
Classifier:C. Agee, UNM
Type spec mass (g):21.4
Type spec location:UNM
Main mass:WangZ
Comments:WZY-03; submitted by C. Agee
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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