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Northwest Africa 15717
Basic information Name: Northwest Africa 15717
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15717
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1000 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 156 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 19 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15717 (NWA 15717)

(Northwest Africa)

Purchased: 2022

Classification: Ungrouped achondrite

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

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

Petrography: The meteorite is an achondritic breccia composed up to 2 cm sized lithic and up to 8 mm sized euhedral to subhedral mineral fragments in a fine-grained cataclastic and related matrix. Most abundant in all lithologies are Mg-rich, mostly compositionally homogeneous olivine (about 75 vol%) and low-Ca pyroxene (about 20 vol%). Zoned olivine and exsolved pyroxenes are rare. Accessories (about 5 vol%) include silica, chromite, FeS, kamacite, and taenite. Contains augite-chromite and orthopyroxene-chromite symplectites. No feldspar found.

Geochemistry: compositions of individual olivine grains: Fa9.8±0.1, FeO/MnO=37±3, n=7; Fa16.7±0.1, FeO/MnO=37±1, n=7; Fa18.6±0.1, FeO/MnO=38±2, n=10; Fa20.1±0.1, FeO/MnO=41±2, n=7; Fa24.9±0.1, FeO/MnO=40±1, n=7; fayalite: Fa82.7±0.2, FeO/MnO=39±1, n=5; zoned olivine: Fa25.3±3.1 (Fa21.6-29.1, FeO/MnO=43±3, n=7); low-Ca pyroxene: Fs34.5±0.3Wo3.6±0.2, FeO/MnO=28-31, n=7); low-Ca pyroxene host to exsolution lamellae: Fs65.4±0.4Wo7.4±0.1 (Fs64.7-65.7Wo7.2-7.6, FeO/MnO=24-27, n=7); Ca-pyroxene exsolution lamellae: Fs38.5±1.8Wo38.1±2.2 (Fs37.3-41.6Wo34.3-40.0, FeO/MnO=29-34, n=7); chromite: Mg#41.5±0.8, Cr#70.2±0.2, n=7

Classification: Ungrouped achondrite, lherzolitic breccia. Likely paired with NWA 12217, NWA 12319, NWA 12562, NWA 13954, NWA 14993, and NWA 15663.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):1000
Pieces:several
Class:Achondrite-ung
Shock stage:low
Weathering grade:low
Fayalite (mol%):9.8; 16.7; 18.6; 20.1; 24.9; 82.7; 25.3
Ferrosilite (mol%):34.5; 65.4; 38.5
Wollastonite (mol%):3.6: 7.4; 38.1
Magnetic suscept.:3.29
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:Polandmet - Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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