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Northwest Africa 10919
Basic information Name: Northwest Africa 10919
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10919
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 54.5 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Dec 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10919 (NWA 10919)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, monomict)

History: A 54.5 g stone, half covered in dark fusion crust was acquired by Michael Farmer from a Moroccan meteorite dealer at the 2016 Tucson Gem and Mineral show.

Physical characteristics: Moderately angular, monomict breccia stone with well-developed fusion crust. Sawn surface is light colored with anastomosing pattern of darker shock veins and rounded clasts of unshocked material. Low weathering and sparse iron staining observed.

Petrography: (S. Ray and T. Gabriel, ASU) Typical basaltic texture dominated by roughly equal proportions of pyroxene and plagioclase, with regions showing ophitic texture. Pyroxene commonly with exsolution lamellae (low-Ca lamellae within high-Ca host and vice-versa). In unshocked regions, size of pyroxene grains and plagioclase laths to 800 μm. Plagioclase has abundant 5-10 μm inclusions and many laths feature scalloped margins. Accessories include troilite, ilmenite, chromite, and silica. Sparse Ni-free iron metal grains (about 10 μm) occur with assemblage of accessories. Locally, pyroxene and plagioclase shows undulatory extinction, alteration to glass, and extensive fracturing.

Geochemistry: Low-Ca pyroxene (N=6): Fs 55.8±5.0Wo11.5±5.6 (Fs49.1-61.0Wo5.6-18.4, FeO/MnO = 32-33); High-Ca pyroxene (N=7): Fs33.9±3.6Wo37.9±4.2 (Fs31.7-42.0Wo28.6-40.6 FeO/MnO = 30-38); Plagioclase (n=13): An87.9±0.2 (An87.7-88.1).

Classification: Eucrite (monomict breccia), low weathering, moderate shock.

Specimens: 11.1 g and a polished thin section at ASU. Main mass with MFarmer

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):54.5
Pieces:1
Class:Eucrite-mmict
Shock stage:medium
Weathering grade:low
Classifier:S. Ray, T. Gabriel, ASU
Type spec mass (g):11.1
Type spec location:ASU
Main mass:ASU
Finder:anonymous
Comments:ASU#2032; submitted by L. Garvie
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, 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
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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