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Northwest Africa 16096
Basic information Name: Northwest Africa 16096
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16096
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 730 g
Meteoritical Bulletin:  MB 112  (2024)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 9 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 29 Sep 2023
Writeup from MB 112:

Northwest Africa 16096 (NWA 16096)

Ouargla, Algeria

Find: 2022 Nov

Classification: HED achondrite (Diogenite, anomalous)

History: Found in November 2022 in the Ouargla Province in Algeria; later sold to Edwin Thompson in 2023, who subsequently sold the main mass to Paul Stahura.

Physical characteristics: Single stone with minor brown fusion crust. A slice of the interior reveals a moderately vesicular rock.

Petrography: (D. Sheikh, Cascadia) Sample displays a granular texture (triple junctions evident at many grain boundaries) comprised predominantly of slightly-zoned, sub-angular, equant orthopyroxene (~0.9 mm average, largest grain ~ 1.5 mm, ~94 vol.%). Olivine is primarily sub-rounded (~ 0.2 mm average, largest grain ~1 mm) and minorly dispersed throughout the sample (~1 vol. %), although there is an "olivine bundle" identified in the section analyzed that is comprised of numerous olivine grains clustered together that measures 7 mm overall in the longest dimension (~4 vol. %). Other minor phases identified include calcic plagioclase and high-Ca pyroxene (~1 vol. % combined), and accessory phases identified include troilite, chromite, Cr-spinel, and Fe-Ni metal (<1 vol. %). Spherical vesicles are abundant throughout the sample, with the largest measuring ~1.5 cm in diameter.

Geochemistry: Olivine (Fa31.5±1.4, range Fa29.3-33.2, Fe/Mn = 42±1, n=14), Low-Ca Pyroxene (Fs25.5±1.1Wo2.9±1.1, range Fs23.0-27.3Wo0.8-4.0, Fe/Mn = 28±2, n=22), High-Ca Pyroxene (Fs12.2±0.6Wo42.0±1.0, range Fs11.8-12.6Wo41.3-42.7, Fe/Mn = 32±6, n=2), Calcic plagioclase (An85.4±2.5, range An82.2-90.6, n=12).

Classification: Diogenite (anomalous, vesicular, olivine-bearing). The abundant vesicles in this sample are an anomalous feature, similar to that observed in NWA 12973 and Dhofar 700.

Specimens: 21 g at Cascadia, main mass with Paul Stahura.

Data from:
  Table 0
  Line 0:
Date:2022 Nov
Mass (g):730
Shock stage:low
Weathering grade:low
Fayalite (mol%):31.5±1.4
Ferrosilite (mol%):25.5±1.1, 12.2±0.6
Wollastonite (mol%):2.9±1.1, 42.0±1.0
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21
Type spec location:Cascadia
Main mass:Paul Stahura
Comments:CML 1631; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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