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3.73g Ureilite Augite-bearing Meteorite Slice I NWA 11900 Achondrite

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  • $ 185.00


On Offer:  3.73g Augite-bearing Ureilite meteorite NWA11900 slice - Primitive chondrite Meteorite
Official name: NWA11900
Classification: Augite-bearing Ureilite
Description:  A 3.73 gram unpolished partial slice of the Augite-bearing Ureilite Achondrite Meteorite NWA 11900. This ureilite is only one of four listed by Meteoritical Bulletin as being "Augite-bearing". 
What you get:  3.73 gram NWA 11900 Augite-bearing Ureilite Meteorite Specimen as Shown, Membrane storage/display box, signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.  

Northwest Africa 11900
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:help 457 g
Recommended:   Ureilite    [explanation]

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)

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.

Data from:
  Table 0
  Line 0:
Place of purchase: Western Sahara
Date: P 2017
Mass (g): 457
Pieces: 1
Class: Ureilite
Shock stage: low
Weathering grade: moderate
Fayalite (mol%): 22.2±0.1
Ferrosilite (mol%): 18.6±0.3, 11.7±0.1
Wollastonite (mol%): 4.2±0.1, 34.9±0.1
Classifier: C. Agee, UNM
Type spec mass (g): 20.7
Type spec location: UNM
Main mass: Dustin Dickens
Comments: Field name DD-27; submitted by C. Agee, UNM