Ureilite Augite-bearing Meteorite 4.51g I NWA11900 Achondrite
|Northwest Africa 11900|
Name: Northwest Africa 11900
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11900
Observed fall: No
Year found: 2017
Country: Western Sahara
Mass: 457 g
This is 1 of 475 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites
|Comments:||Approved 2 Sep 2018|
Writeup from MB 107:
Northwest Africa 11900 (NWA 11900)
History: Purchased by Dustin Dickens from nomad near Dahkla in Western Sahara.
Physical characteristics: Weathered exteri; saw cut reveals an interior mosaic of green and brown crystals.
Petrography: (C. Agee, UNM) This meteorite consists of olivine, pigeonite, and augite. Ubiquitous fine-grained Fe-metal is present along grain boundaries. Elongate (100-200 μm) grains of graphite are scattered throughout.
Geochemistry: (C. Agee, UNM) Olivine Fa22.2±0.1, Fe/Mn=49±1, Cr2O3=0.36±0.02 (wt%), n=7; pigeonite Fs18.6±0.3Wo4.2±0.1, Fe/Mn=29±1, n=4; augite Fs11.7±0.1Wo34.9±0.1, Fe/Mn=22±1, n=3.
Classification: Augite-bearing ureilite
Specimens: 20.7 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.