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Northwest Africa 8400
Basic information Name: Northwest Africa 8400
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8400
Observed fall: No
Year found: 2014
Country: Western Sahara
Mass:help 1026 g
Meteoritical Bulletin:  MB 103  (2014)  H7
Recommended:  H7    [explanation]

This is 1 of 31 approved meteorites classified as H7.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 8 Aug 2014
Writeup from MB 103:

Northwest Africa 8400 (NWA 8400)

Western Sahara

Found: 2014

Classification: Ordinary chondrite (H7)

History: Found by a meteorite hunter on a 2014 Jan-Feb expedition in Western Sahara, and subsequently purchased by Darryl Pitt.

Physical characteristics: Single stone with brown weathered exterior. Saw cut reveals polygonal texture of dark colored silicates and metal/sulfides.

Petrography: (C. Agee, UNM) Examination of a polished mount shows intergranular texture of olivines and pyroxenes, grain size 50-500 μm, plagioclase >100 μm, ~10% metal and sulfide, numerous oxide veinlets.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa18.6±0.4, Fe/Mn=38±2, n=7; low Ca-pyroxene Fs16.2±0.6Wo3.3±0.5, Fe/Mn=24±1; augite Fs8.9Wo37.4, Fe/Mn=17, Cr2O3=1.3 wt%; plagioclase An28.5±2.0Ab78.3±1.2Or3.3±0.4, n=6. Oxygen isotopes (Karen Ziegler, UNM) Oxygen isotope values of 3 acid-washed aliquots of bulk sample, 1.3, 1.3, 1.1 mg, gave δ17O = 2.979, 3.056, 2.753, δ18O = 4.763, 4.947, 4.212, Δ17O = 0.464, 0.444, 0.529 (linearized, all permil).

Classification: H chondrite, H7, based on oxygen isotope values that are in the H-chondrite range, absence of chondrules, recrystallized silicates, remobilized metal-sulfide, Fa and Fs values that are H-chondrite-like.

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

Data from:
  Table 0
  Line 0:
Mass (g):1026
Weathering grade:W2
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:DPitt
Comments:Field name MAC 0032; submitted by C. Agee, UNM
Plots: O isotopes:  
   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)
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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Western Sahara

     This is 1 of 281 approved meteorites from Western Sahara (plus 20 unapproved names)

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