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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:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 140 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 f├╝r Naturkunde, Invalidenstra├če 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 Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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