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Northwest Africa 15857
Basic information Name: Northwest Africa 15857
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15857
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 800 g
Meteoritical Bulletin:  MB 112  (2024)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 83 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 15 Oct 2023
Writeup from MB 112:

Northwest Africa 15857 (NWA 15857)

(Northwest Africa)

Purchased: July 2021

Classification: Enstatite achondrite (Aubrite)

History: Purchased in July 2021 by Geologist Juan Avilés Poblador, Roger Jones, and Sean Mahoney from a meteorite dealer in south Morocco.

Physical characteristics: Many grayish to grayish-white pieces and fragments (some contain orange-colored spots due to weathering). Some fragments contain minor fusion crust, others contain a network of dark shock melt veins on their surfaces.

Petrography: (D. Sheikh, Cascadia) Specimen represents a coarse-grained breccia comprised of strongly shocked mm to cm-sized enstatite grains (some containing inclusions of diopside) set within a matrix containing dark shock melt veins. Accessory phases identified include Ti-bearing troilite, daubréelite, and Si-bearing kamacite. Forsterite and plagioclase were not observed in the section analyzed.

Geochemistry: Enstatite (Fs0.1±0.1Wo0.5±0.2, range Fs0.1-0.2Wo0.4-0.8, n=15), Diopside (Fs0.1±0.1Wo43.9±2.6, range Fs0.1-0.2Wo42.1-45.8, n=3).

Classification: Achondrite (Aubrite)

Specimens: 20.5 g at Cascadia, main mass with Sean Mahoney (200 g), Geologist Juan Avilés Poblador (350 g), and Roger Jones (250 g).

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P July 2021
Mass (g):800
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):0.1±0.1, 0.1±0.1
Wollastonite (mol%):0.5±0.2, 43.9±2.6
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.5
Type spec location:Cascadia
Main mass:Geologist Juan Avilés Poblador, Roger Jones, and Sean Mahoney
Comments:CML 1584; submitted by Daniel Sheikh
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
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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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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