Lunar meteorite (feldspathic breccia) |Northwest Africa 13974
Northwest Africa 13974 (NWA 13974)
This fantastic specimen weighs 9.2g
Classification: Lunar meteorite
History: Multiple complete individuals ranging in size from 1 - 800 g were found in the Western Sahara. Adam Aaronson purchased the samples in Temara in 2021
Physical characteristics: Exterior of the 20% of the samples is light orangish-gray in color and shows voids, some of which are circular in profile. The cut face shows the interior is darker grey and shows a brecciated texture. Other samples found on the surface are reported to have a shiny black wind-ablated exterior.
Petrography: Description and classification (A. Love, App) Sample is a complex breccia composed of rounded to irregular-shaped, mm-sized lithic and anhedral mineral clasts surrounded by a melt matrix. Lithic clasts include: anorthosite, norite, troctolite, brecciated and shock melted clasts. Mineral clasts are dominantly anorthite with minor zoned olivine. Matrix areas within the thin section show some regions with flow-textured glass and fine vesicles. Additional minerals are: <1vol% FeNi grains, chromite, ilmenite, sulfide, secondary barite and calcite.
Geochemistry: (A. Love, App) Olivine (Fa29.1±6.8, Fe/Mn=66-92, n=29); low Ca pyroxene (Fs21.3±3.2Wo4.4±0.5, Fe/Mn=49-55, n=7); pigeonite (Fs24.4±4.0Wo9.0±3.9, Fe/Mn=48-59, n=13); high Ca Pyroxene (Fs11.7±2.1Wo38.6±6.3, Fe/Mn=40-47, n=4); plagioclase (An97.2±0.7Or0.1±0.1, n=18).
Classification: lunar (feldspathic melt breccia A-S3, low weathering). Textures and mineral compositions (Fe/Mn ratios for Olivine and pyroxene and An content of plagioclase) indicate sample is a melt breccia of lunar origin.
Line 0:Place of purchase: TemaraDate: P 2021Mass (g):7940Pieces: manyClass: Lunar Shock stage: A-S3 Weathering grade: low Fayalite (mol%):29.1±6.8 Ferrosilite (mol%):21.3±3.2; 11.7±2.1Wollastonite (mol%):4.4±0.5; 38.6±6.3 Magnetic suscept.:3.52 Classifier: A. Love, AppType spec mass (g):20.2 Type spec location: App Main mass: A. Aaronson Comments: Submitted by Anthony Love Institutions and collections App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:References:Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:Find references in Google Scholar:Geography: Coordinates:Unknown.