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Northwest Africa 15856
Basic information Name: Northwest Africa 15856
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15856
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 530 g
Meteoritical Bulletin:  MB 112  (2024)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 424 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Sep 2023
Writeup from MB 112:

Northwest Africa 15856 (NWA 15856)

Ouargla, Algeria

Find: 2020

Classification: HED achondrite (Eucrite, polymict)

History: A single piece with heavily weathered fusion crust covering 60% of its surface was found by Nomads in the Sahara Desert close to the town of Ouergla, Algeria. It was subsequently purchased by a dealer Nouakchott, Mauritania in April 2021 and sold to Sean Mahoney.

Physical characteristics: One single piece weighing 530 g, with heavily weathered fusion crust over 60% of its surface, and desert varnish over the remaining part.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised of predominantly mm-sized angular to sub-rounded cumulate and basaltic eucrite clasts, and minor diogenite clasts (also mm-sized, <10 vol. %) set within a fragmental, fine-grained matrix. Accessory phases identified include SiO2-rich glass, troilite, and Fe-Ni metal.

Geochemistry: Eucrite Clasts [Low-Ca Pyroxene (Fs47.3±2.7Wo3.5±0.8, range Fs40.3-50.7Wo2.5-4.9, Fe/Mn=30±3, n=12), Pigeonite (Fs43.1±3.2Wo13.5±6.5, range Fs38.5-47.9Wo5.8-24.1, Fe/Mn=32±4, n=11), High-Ca Pyroxene (Fs27.0±2.6Wo36.4±4.3, range Fs24.5-29.9Wo30.6-40.9, Fe/Mn=29±6, n=4), Calcic Plagioclase (An86.8±1.7, range An84.0-89.9, n=19)]; Diogenite Clasts [Low-Ca Pyroxene (Fs32.2±0.9Wo2.6±0.1, range Fs31.5-32.9Wo2.6-2.7, Fe/Mn=33±4, n=2)].

Classification: HED Achondrite (Eucrite, polymict).

Specimens: 20.8 g at Cascadia, main mass with Sean Mahoney.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Nearby to Ouergla
Mass (g):530
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):47.3±2.7, 43.1±3.2, 27.0±2.6, 32.2±0.9
Wollastonite (mol%):3.5±0.8, 13.5±6.5, 36.4±4.3, 2.6±0.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.8
Type spec location:Cascadia
Main mass:Sean Mahoney
Comments:CML 1630; OSM007; 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 50 approved meteorites from Ouargla, Algeria (plus 1 unapproved name)
     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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