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Northwest Africa 8674
Basic information Name: Northwest Africa 8674
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8674
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 12 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Martian (basaltic breccia)
MB 107  (2018)  Martian (polymict breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 12 Dec 2014
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeuphelp
Writeup from MB 103:

Northwest Africa 8674 (NWA 8674)

(Northwest Africa)

Purchased: 2012

Classification: Martian meteorite (basaltic breccia)

History: Purchased by Jay Piatek from Morocco, 2012.

Physical characteristics: Single stone, shiny, black exterior, saw cut reveals breccia with numerous dark and light colored fragmental crystals and polycrystalline lithologies, scattered spherules and spherical objects of variable size and texture, set in a dark gray, fine-grained groundmass, some opaques visible.

Petrography: (A. Santos and C. Agee, UNM) Microprobe examination of the polished deposit sample shows a polymict breccia with fragmental feldspar and pyroxene crystals up to 5 mm, although a few are euhedral. Basaltic, trachytic, andesitic, phosphate-rich clasts, iron-oxide-rich spherules, silicate-rich spherules, spherical matrix-rich objects, all set in a very fine-grained ground mass composed of feldspar, pyroxene, oxides, phosphates, zircon, and sulfide. Ubiquitous larger grains of magnetite + maghemite, Cl-apatite, chromite, and ilmenite throughout, two olivine grains found in one igneous clast.

Geochemistry: (A. Santos and C. Agee, UNM) Large fragmental feldspars: plagioclase Ab51.4±5.2An46.4±5.8Or2.2±0.6, n=21; K-feldspar Ab13.4±2.4An2.0±0.9Or84.7±3.1, n=8; albite Ab88.4±5.5An4.3±2.9Or7.3±3.1, n=8. Igneous clast feldspars: plagioclase Ab60.5±8.3An36.4±9.6Or3.1±1.5, n=206; K-feldspar Ab20.0±8.2An3.0±2.0Or77.0±9.6, n=35; albite Ab83.9±11.2An7.3±6.0Or8.8±6.1, n=23. Large fragmental pyroxenes: low-Ca pyroxene Fs36.8±7.3Wo3.7±0.4, Fe/Mn=33±3, n=19; pigeonite Fs40.3±5.9Wo7.9±5.3, Fe/Mn=34±3, n=42; augite Fs34.9±9.3Wo38.4±3.6, Fe/Mn=29±5, n=45. Igneous clast pyroxenes: low-Ca pyroxene Fs35.2±5.7Wo3.1±1.0, Fe/Mn=34±6, n=121; pigeonite Fs31.2±4.5Wo10.1±3.9, Fe/Mn=34±4, n=81; augite Fs19.9±2.6Wo40.9±5.1, Fe/Mn=33±6, n=32. Olivine Fa32.5±0.7, Fe/Mn=57±4, NiO=0.009±0.003 (wt%), n=2.

Classification: Martian (basaltic breccia). Paired with NWA 7034.

Specimens: 2.5 g on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):12
Pieces:1
Class:Martian (basaltic breccia)
Shock stage:low
Weathering grade:low
Classifier:C. Agee, UNM
Type spec mass (g):2.5
Type spec location:UNM
Main mass:Jay Piatek
Comments:Submitted by C. Agee
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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