3.39g Ureilite Augite-bearing Meteorite Slice I NWA 11900 Achondrite
| Northwest Africa 11900 | |||||||||||||||||||||||||||||||
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| Basic information |
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 |
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| Classification history: |
This is 1 of 475 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites |
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| Comments: | Approved 2 Sep 2018 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 11900 (NWA 11900) Western Sahara Purchased: 2017 Classification: Ureilite 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. |
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| Data from: MB107 Table 0 Line 0: |
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