MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 11 Jul 2024
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 13917
Basic information Name: Northwest Africa 13917
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13917
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 5.2 kg
Meteoritical Bulletin:  MB 110  (2022)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 88 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13917 (NWA 13917)

(Northwest Africa)

Purchased: 2020

Classification: Primitive achondrite (Winonaite)

History: Purchased from Morocco in September 2020 and January 2021.

Physical characteristics: Several identical appearing stones found together -- the largest of which are individuals weighing 1.6 kg, 1.4 kg, and 1.2 kg. Saw-cut surface shows abundant fine-grained metal and sulfide set in a mosaic of brown and gray silicate minerals. A prominent metal vein 2 mm thick and several cm in length crosscuts the deposit sample slice.

Petrography: (C. Agee, UNM) Microprobe 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. Forsterite is ubiquitous but is significantly less abundant than the pyroxenes. Kamacite, taenite, and troilite make up approximately 10% of this meteorite, most grains are 100-300 μm in diameter. A phosphate phase was detected. No feldspar was observed in the microprobe mount.

Geochemistry: (C. Agee UNM) Forsterite Fa4.0±0.0, Fe/Mn=16±0, n=2; enstatite Fs4.7±0.2Wo1.9±0.2, Fe/Mn=13±1, n=3; diopside Fs1.3±0.4Wo44.8±0.3, Fe/Mn=13±7, n=4. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O=4.959, 5.107, 5.236; δ17O=2.055, 2.179, 2.232; Δ17O=-0.563, -0.518, -0.533 (linearized, all per mil, TFL slope=0.528).

Classification: Primitive achondrite (Winonaite)

Specimens: 67.9 g on deposit at UNM. Mark Lyon holds the main masses.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):5.2 kg
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):4.0±0.0
Ferrosilite (mol%):4.7±0.2, 1.3±0.4
Wollastonite (mol%):1.9±0.2, 44.8±0.3
Classifier:C. Agee, UNM
Type spec mass (g):67.9
Type spec location:UNM
Main mass:Mark Lyon
Comments:Submitted by C. Agee
Plots: O isotopes:  
   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)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
Find references in Google Scholar:

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

Direct link to this page