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Northwest Africa 16484
Basic information Name: Northwest Africa 16484
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16484
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 292 g
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 35 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 16 Feb 2024
Writeup from MB 113:

Northwest Africa 16484 (NWA 16484)

(Northwest Africa)

Purchased: 2023

Classification: Lunar meteorite (frag. breccia)

History: Purchased in 2023 by Craig Zlimen from a meteorite dealer in Morocco.

Physical characteristics: Two pieces with fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a polymict breccia comprised of mm-sized, angular to sub-rounded lithic and mineral clasts set within a fine-grained fragmental matrix. Clast lithologies identified include: troctolites, gabbros, anorthosites, basalts, impact melt clasts; an Mg-suite troctolite clast contains a noticeable symplectite displaying a vermicular texture comprised of Cr-spinel, augite, and orthopyroxene. Accessory phases identified within the host rock include troilite, Ca-phosphates (apatite/merrillite), ilmenite, and Fe-Ni metal.

Geochemistry: Olivine (Fa30.4±15.0, range Fa19.6-66.5, Fe/Mn=84±13, n=12), Low-Ca Pyroxene (Fs27.7±10.1Wo3.1±0.3, range Fs16.5-44.8Wo2.3-3.6, Fe/Mn=56±9, n=18), Pigeonite (Fs44.4±11.5Wo15.0±6.7, range Fs27.4-60.8Wo5.8-24.4, Fe/Mn=57±8, n=17), Augite (Fs33.8±22.0Wo36.2±6.4, range Fs7.4-60.4Wo26.9-45.8, Fe/Mn=54±14, n=13), Calcic Plagioclase (An95.8±2.1, range An90.3-97.8, n=22).

Classification: Lunar (fragmental breccia) due to polymict nature of the sample.

Specimens: 20.2 g at Cascadia, main mass with Craig Zlimen.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2023
Mass (g):292
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):30.4±15.0
Ferrosilite (mol%):27.7±10.1, 44.4±11.5, 33.8±22.0
Wollastonite (mol%):3.1±0.3, 15.0±6.7, 36.2±6.4
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.2
Type spec location:Cascadia
Main mass:Craig Zlimen
Comments:CML 1600; 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 Meteoritical Bulletin, no. 113, in preparation (2024)
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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