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Northwest Africa 15663
Basic information Name: Northwest Africa 15663
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15663
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 405 g
Meteoritical Bulletin:  MB 112  (2023)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 142 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 11 Feb 2023
Writeup from MB 112:

Northwest Africa 15663 (NWA 15663)

(Northwest Africa)

Purchased: January, 2023

Classification: Ungrouped achondrite

History: The meteorite was purchased from a meteorite dealer in Mauritania.

Physical characteristics: Four light grayish to cream-colored fragments with patches of black fusion crust.

Petrography: Achondritic breccia composed of olivine (about 85 vol%), pyroxene (about 10 vol%), and accessories (about 5 vol%). Olivine and pyroxene are generally Mg-rich and present as euhedral to subhedral up to 2.5 mm sized mostly fragmented crystals. The vast majority of the grains are chemically homogeneous but show compositional differences between individual grains. A single zoned olivine grain and few exsolved pyroxenes were detected. Minor phases include silica, chromite, FeS, kamacite, and taenite. Contains augite-chromite and orthopyroxene-chromite symplectites. No feldspar found.

Geochemistry: compositions of individual olivine grains: Fa8.9±0.1, FeO/MnO=38±3, n=10; Fa13.6±0.1, FeO/MnO=38±3, n=10; Fa18.6±0.1, FeO/MnO=38±2, n=10; Fa23.9±0.1, FeO/MnO=40±2, n=10; zoned olivine: Fa11.0±2.4 (Fa8.6-14.1, FeO/MnO=40±4, n=10); compositions of individual low-Ca pyroxene grains: Fs19.2±0.2Wo3.8±0.6, FeO/MnO=22-25, n=10); Fs23.8±0.1Wo3.8±0.1, FeO/MnO=25-30, n=10); augite: Fs5.1±0.1Wo44.7±0.2 (Fs4.8-5.3Wo44.2-45.1, FeO/MnO=13-17, n=10); low-Ca pyroxene host to exsolution lamellae: Fs37.3±0.7Wo3.0±0.2 (Fs36.2-38.0Wo2.7-3.5, FeO/MnO=24-27, n=10); Ca-pyroxene exsolution lamellae: Fs16.4±0.3Wo41.1±0.5 (Fs15.8-17.0Wo40.5-41.8, FeO/MnO=19-22, n=10); chromite: Mg#47.2±0.3, Cr#74.3±0.3, n=7

Classification: Ungrouped achondrite, lherzolitic breccia. Likely paired with NWA 12217, NWA 12319, NWA 12562, NWA 13954, and NWA 14993.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P January, 2023
Mass (g):405
Shock stage:low
Weathering grade:low
Fayalite (mol%):8.9; 13.6; 18.6; 23.9; 11.0
Ferrosilite (mol%):19.2; 23.8; 5.1; 37.3; 16.4
Wollastonite (mol%):3.8; 3.8; 44.7; 3.0; 41.1
Magnetic suscept.:2.84
Classifier:A. Greshake, MNB
Type spec mass (g):20.5
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin and Hanno Strufe
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Volker Heinrich   
Public domain photographs:
Ansgar Greshake               

     This is 1 of 9559 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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