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Northwest Africa 14986
Basic information Name: Northwest Africa 14986
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14986
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 3.69 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL7-melt breccia
Recommended:  LL7-melt breccia    [explanation]

This is the only approved meteorite classified as LL7-melt breccia.
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14986 (NWA 14986)

(Northwest Africa)

Purchased: 2021

Classification: LL7-melt breccia

History: Purchased by Ziyao Wang in August 2021 from Said Muftah Bachir in Laayoune, Morocco.

Physical characteristics: Single stone with weathered light brown-green exterior. Sawn surfaces show brecciated fine-grained clasts bounded and penetrated by pervasive dark shock melt pools and veins.

Petrography: (A. Ross and C. Agee, UNM) Backscattered electron and reflected light microscope images show fine grain recrystallized olivine, pyroxene, and plagioclase intruded upon by ubiquitous shock melt. No chondrule is visible. Minor phases include chromite, troilite, and oxidized iron. Metal was not detected.

Geochemistry: (A. Ross, UNM) Olivine Fa25.1±1.5, Fe/Mn=49±3, n=8; pigeonite Fs19.0±1.0Wo4.5±2.5, Fe/Mn=29±2, n=7; augite Fs13.8±1.2Wo33.7±4.7, Fe/Mn=25±1, n=3; plagioclase Ab81.0±4.7An17.9±4.4, n=6. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 5.686, 5.656, 5.642; δ17O= 4.007, 3.974, 3.960; Δ17O= 1.005, 0.988, 0.981 (linearized, all per mil, TFL slope=0.528).

Classification: Ordinary chondrite LL7 melt breccia. The oxygen isotope values of this meteorite plot in the LL-chondrite field. Melt breccia based on the brecciated LL7 clasts set in a shock melt matrix.

Specimens: 27 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 2021
Mass (g):3686
Pieces:1
Class:LL7-melt breccia
Shock stage:high
Weathering grade:low
Fayalite (mol%):25.1±1.5
Ferrosilite (mol%):19.0±1.0
Wollastonite (mol%):4.5±2.5
Classifier:C. Agee, UNM
Type spec mass (g):27
Type spec location:UNM
Main mass:WangZ
Comments:WZY-01; 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 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:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Qi Lv         
Ziyao Wang      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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Revision
  history:
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