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Northwest Africa 16349
Basic information Name: Northwest Africa 16349
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16349
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 50 g
Meteoritical Bulletin:  MB 112  (2024)  Lunar (bas/gab brec)
Recommended:  Lunar (bas/gab brec)    [explanation]

This is 1 of 3 approved meteorites classified as Lunar (bas/gab brec).   [show all]
Search for other: Lunar meteorites
Comments: Approved 3 Jan 2024
Writeup from MB 112:

Northwest Africa 16349 (NWA 16349)


Find: 2020

Classification: Lunar meteorite (basalt/gabbroic breccia)

History: Found in 2020 in Algeria; later purchased in 2023 by Matthew Stream from Bachir Salek.

Physical characteristics: Single stone with dark colored fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised primarily of two distinct lithologies: [1] A basaltic lithology comprised predominantly of mm-sized (largest ~2.5 mm) weakly zoned, subhedral olivine phenocrysts (some containing embayments), and few chromite phenocrysts of similar size, set within a mostly sub-ophitic groundmass comprised of <250 μm-sized (Av. ~120 μm, grain size slightly varies across sample) elongate/tabular high-Ca pyroxene, pigeonite, and plagioclase. Accessory phases identified include troilite and kamacite. [2] A gabbroic lithology comprised predominantly of mm-sized (largest ~4.5 mm) sub-angular to sub-rounded gabbroic clasts (made up of of equant and tabular plagioclase, pigeonite, high-Ca pyroxene, olivine, ilmenite, silica, and chromian spinel), set within a fine-grained fragmental matrix containing accessory fluorapatite, troilite, and kamacite.

Geochemistry: Basaltic Lithology [Olivine (Fa38.1±9.2, range Fa32.8-90.0, Cr (ppm) = 2300±400, Mn (ppm) = 2900±300, Fe/Mn=85±6, n=55), Pigeonite (Fs57.3±14.7Wo17.3±4.2, range Fs33.1-79.4Wo10.6-23.1, Ti# = 85±12, Fe# = 69±17, Fe/Mn=65±6, n=13), High-Ca Pyroxene (Fs31.0±8.6Wo32.9±4.0, range Fs25.1-65.3Wo26.0-44.1, Ti# = 68±11, Fe# = 46±12, Fe/Mn=52±7, n=44), Calcic Plagioclase (An89.7±1.7Or0.5±0.1, range An85.4-92.5Or0.1-0.7, n=37), Chromian Spinel (Cr# = 69±1, Mg# = 29±2, n=14), Bulk composition estimated using multiple large area EDS spectra (Mg# ~36.5, Al2O3 (wt. %) ~11.7, K2O (wt. %) ~0.02, TiO2 (wt. %) ~2.29, MgO (wt. %) ~7.1, CaO (wt. %) ~11.2, Cr (ppm) ~2100]; Gabbroic Lithology [Olivine (Fa49.7±6.0, range Fa43.1-61.5, Fe/Mn=88±4, n=8), Pigeonite (Fs52.8±13.3Wo17.2±3.7, range Fs34.0-77.7Wo9.9-23.9, Fe/Mn=61±7, n=39), High-Ca Pyroxene (Fs41.1±16.2Wo30.6±4.7, range Fs22.5-70.7Wo25.2-37.6, Fe/Mn=59±10, n=26), Calcic Plagioclase (An90.8±2.3Or0.7±1.0, range An84.5-94.0Or0.1-4.5, n=31)].

Classification: Lunar (mare basalt/gabbro breccia). Basaltic lithology compositionally resembles that of Apollo 14 high-alumina olivine mare basalts based on bulk, olivine, and pyroxene compositions.

Specimens: 10.3 g at Cascadia, main mass with Matthew Stream.

Data from:
  Table 0
  Line 0:
Mass (g):50
Class:Lunar (bas/gab brec)
Shock stage:high
Weathering grade:low
Fayalite (mol%):38.1±9.2, 49.7±6.0
Ferrosilite (mol%):57.3±14.7, 31.0±8.6, 52.8±13.3, 41.1±16.2
Wollastonite (mol%):17.3±4.2, 32.9±4.0, 17.2±3.7, 30.6±4.7
Classifier:D. Sheikh, Cascadia
Type spec mass (g):10.3
Type spec location:Cascadia
Main mass:Matthew Stream
Comments:CML 1650; 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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Public domain photographs:
Daniel Sheikh   


     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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