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Northwest Africa 15644
Basic information Name: Northwest Africa 15644
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15644
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1.9 g
Meteoritical Bulletin:  MB 112  (2023)  Lunar (gabbro)
Recommended:  Lunar (gabbro)    [explanation]

This is 1 of 14 approved meteorites classified as Lunar (gabbro).   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Feb 2023
Writeup from MB 112:

Northwest Africa 15644 (NWA 15644)

(Northwest Africa)

Purchased: 2022

Classification: Lunar meteorite (gabbro)

History: Acquired online by Daniel Sheikh.

Physical characteristics: Single stone with partial fusion crust. Dark shock veins are visible running through the interior.

Petrography: (D. Sheikh, Cascadia) Sample is a coarse-grained igneous rock displaying a predominant cumulate texture comprised of ~mm-sized subhedral olivine, pigeonite, subcalcic augite, low-Ca pyroxene, and calcic plagioglase. Accessory phases include K-spar, baddeleyite, fluorapatite, ilmenite, merrillite, pentlandite, Ti-bearing chromite, troilite, and taenite.

Geochemistry: Olivine (Fa31.6±0.3, range Fa31.0-32.4, Fe/Mn=87±6, n=23), Low-Ca Pyroxene (Fs26.6±0.5Wo3.9±0.2, range Fs26.2-27.0Wo3.7-4.1, Fe/Mn=55±3, n=2), Pigeonite (Fs25.2±0.8Wo10.6±2.3, range Fs23.4-26.6Wo7.9-16.5, Fe/Mn=50±4, n=14), High-Ca Pyroxene (Fs15.3±1.4Wo36.5±2.2, range Fs13.0-18.7Wo32.4-39.9, Fe/Mn=43±6, n=16), Calcic Plagioclase (An91.2±1.7Or1.3±0.3, range An87.5-93.1Or0.7-1.9, n=17). (M. Neuman, WUSL) Bulk rock chemistry (in wt. %): SiO2=43.9±0.2, Al2O3=5.1±0.1, FeO=19.2±0.8, MgO=24.7±0.1, CaO=5.1±0.1, Na2O=0.1±0.1, K2O=0.1±0.1, TiO2=0.4±0.1, Cr2O3=0.4±0.1, MnO=0.2±0.1; (in ppm) Sm=4.4±0.1, Sc=24.5±0.7, Th=1.6±0.1, U=0.5±0.1.

Classification: Lunar (gabbro). Sample is texturally and compositionally (both in mineral chemistry and bulk rock chemistry) identical to NWA 2977, NWA 6950, and other members of the NWA 773 clan, indicating this sample is likely paired alongside those.

Specimens: 0.71 g at Cascadia, main mass with Daniel Sheikh.

Data from:
  Table 0
  Line 0:
Place of purchase:online
Date:P 2022
Mass (g):1.9
Class:Lunar (gabbro)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):31.6±0.3
Ferrosilite (mol%):26.6±0.5, 25.2±0.8, 15.3±1.4
Wollastonite (mol%):3.9±0.2, 10.6±2.3, 36.5±2.2
Classifier:D. Sheikh, Cascadia
Type spec mass (g):0.71
Type spec location:Cascadia
Main mass:Daniel Sheikh
Comments:CML 1535; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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