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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
Classification
  history:
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
Writeuphelp
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:
  MB112
  Table 0
  Line 0:
State/Prov/County:Ouargla
Date:2022 Nov
Mass (g):730
Pieces:1
Class:Diogenite-an
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
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 46 approved meteorites from Ouargla, Algeria (plus 1 unapproved name)
     This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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