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Northwest Africa 10256
Basic information Name: Northwest Africa 10256
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10256
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 707 g
Meteoritical Bulletin:  MB 104  (2015)  CR2
Recommended:  CR2    [explanation]

This is 1 of 188 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 8 Sep 2015
Writeup from MB 104:

Northwest Africa 10256 (NWA 10256)

(Northwest Africa)

Purchased: 2015 Feb

Classification: Carbonaceous chondrite (CR2)

History: Purchased by Aerolite Meteorites

Physical characteristics: Six identical appearing pieces with smooth abraded fusion crust. A saw cut reveals many distinct chondrules of variable size set in a dark-gray groundmass. Largest chondrule up to 3 mm in diameter; a few, very small CAIs are visible in the hand specimen.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, many porphyritic, some with irregular shapes. Apparent mean chondrule size 625±325 μm (in microprobe section), n=18. Fine grained matrix with abundant, finely disseminated metal and sulfide makes up approximately 40% of this meteorite.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa5.4±3.6, Fe/Mn=55±30, Cr2O3=0.10±0.06 wt%, n=21, low-Ca pyroxene Fs3.3±5.0Wo1.6±1.4, Fe/Mn=19±13, n=9.

Classification: Carbonaceous chondrite CR2.

Specimens: 25.82 g including a probe mount on deposit at UNM, Aerolite Meteorites holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015 Feb
Mass (g):707.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):5.4±3.6
Ferrosilite (mol%):3.3±5.0
Wollastonite (mol%):1.6±1.4
Classifier:C. Agee, UNM
Type spec mass (g):25.82
Type spec location:UNM
Main mass:Aerolite Meteorites Inc.
Comments:AE-3; submitted by C. Agee
   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)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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