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Northwest Africa 8233
Basic information Name: Northwest Africa 8233
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8233
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 916 g
Meteoritical Bulletin:  MB 103  (2014)  H6
Recommended:  H6    [explanation]

This is 1 of 6210 approved meteorites (plus 9 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Feb 2014
Writeup from MB 103:

Northwest Africa 8233 (NWA 8233)

(Northwest Africa)

Purchased: Nov 2013

Classification: Ordinary chondrite (H6)

History: 916 g stone purchased by Michael Farmer in Risanni, Morocco, November, 2013.

Physical characteristics: (L. Garvie, ASU) Exterior shows patchy, black fusion crust. Interior is vuggy (average 200 to 300 μm), dark greenish, without signs of weathering. Rare chondrules visible, one to 3 mm. Sawn surface shows an even distribution of irregular, small (average 300 μm) kamacite and troilite. No shock veins present.

Petrography: (K. Domanik, UAz) SEM examination of a polished mount shows a small number of poorly delineated chondrules in a mostly recrystallized matrix along with abundant metal and troilite. Fine-grained (1-20 μm) plagioclase ubiquitous, some 50-200 μm. Other minerals include olivine, low Ca-pyroxene, high-Ca pyroxene, chromite, Cl-apatite, merrillite, and minor taenite and tetrataenite.

Geochemistry: (K. Domanik U.A.) EPMA. Olivine Fa19.3±0.2, Fe/Mn=37±2, n=24; low-Ca pyroxene Fs16.9±0.2Wo1.4±0.2, Fe/Mn=21±1, n=21; high-Ca pyroxene Fs6.3±0.5Wo45.0±1.7, Fe/Mn=15±2, n=6; plagioclase Ab83.1±1.0An11.6±0.5Or5.2± 1.0, n=10; kamacite Fe=92.21±0.38, Ni=6.56±0.08, Co=0.48± 0.04 wt%, n=7; taenite Fe=69.22±0.36, Ni = 29.41±0.76, Co=0.15±0.03 wt%, n=4; tetrataenite Fe=49.34, Ni=49.64, Co=0.07 wt%, n=1; Troilite Ni = 1.1 wt%, n=2.

Classification: Ordinary chondrite, H6, W1.

Data from:
  Table 0
  Line 0:
Place of purchase:Rissani, Morocco
Date:P Nov 2013
Mass (g):916
Weathering grade:W1
Fayalite (mol%):19.3±0.2
Ferrosilite (mol%):16.9±0.2
Wollastonite (mol%):1.4±0.2
Classifier:K. Domanik, UAz, L. Garvie, ASU
Type spec mass (g):25.6
Type spec location:ASU
Main mass:MFarmer
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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