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Northwest Africa 10890
Basic information Name: Northwest Africa 10890
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10890
Observed fall: No
Year found: 2016
Country: Mauritania
Mass:help 281 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 604 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 18 Nov 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10890 (NWA 10890)

Mauritania

Purchased: April 2016

Classification: Ureilite

History: Found by meteorite hunters during an expedition near the Western Saharan, Algerian and Mauritanian border region. Purchased in Mauritania.

Physical characteristics: Single stone with no fusion crust, irregular exterior surface. Saw-cut surfaces show a mosaic of dark colored olivine grains.

Petrography: (C. Agee, UNM) This meteorite has a modal abundance of ~95% olivine. The olivine shows reduction rims with fine-grained iron metal; ubiquitous graphite present. No pyroxene was detected in the probe section.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine cores Fa14.0±0.0, Fe/Mn=35±2, Cr2O3=0.69±0.02 (wt%), CaO=0.28±0.01 (wt%), n=5; Olivine rims Fa2.9±2.3, Fe/Mn=7±6, Cr2O3=0.69±0.19 (wt%), CaO=0.33±0.01 (wt%), n=2.

Classification: Ureilite (dunitic)

Specimens: 20.5 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P April 2016
Mass (g):281.4
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):14.0±0.9
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH70; submitted by C. Agee, UNM
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 165 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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