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Northwest Africa 6874
Basic information Name: Northwest Africa 6874
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6874
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 90 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 49 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 18 Jul 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6874 (NWA 6874)

Morocco

Purchased: 2011

Classification: Primitive achondrite (Brachinite)

History: Purchased by Jay Piatek in 2011.

Physical characteristics: Single stone of 90 g, rough, weathered, dark fusion crust. Dark colored interior cross cut by oxidized weathering veins.

Petrography: (C. Agee, UNM) SEM, EDS, EMPA. Microprobe examination of a polished epoxy mount shows olivine 80%, low-Ca pyroxene 9%, augite 8%, chromite 2%, tiny sulfide inclusions decorate silicate grain boundaries, Fe-metal (oxidized) as films in grain boundaries and crosscutting veinlets. Olivine grains to 1 mm. Polygonal texture with numerous 120° triple junctions.

Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. Olivine Fa29.1±1.2, Fe/Mn=59 ± 2, N=13; low-Ca pyroxene Fs25.4±0.1Wo2.2, Fe/Mn=39 ± 1, N=12; augite Fs10.3±0.2Wo45.0±0.3, Fe/Mn=30 ± 6, N=10; chromite Cr#=0.75, Mg#=0.24, TiO2=1.16 ± 0.02 wt%.

Classification: Achondrite (brachinite), weathering grade W3, low shock grade. Mineral proportions, compositions and geochemistry similar to NWA 595.

Specimens: 18 g and probe mount on deposit at UNM. Piatek holds the main mass.

Data from:
  MB100
  Table 1
  Line 1523:
Place of purchase:Morocco
Date:P 2011
Mass (g):90
Pieces:1
Class:Brachinite
Fayalite (mol%):29.1±1.2
Ferrosilite (mol%):25.4±0.1; 10.3±0.2
Wollastonite (mol%):2.2; 45.0± 0.3
Classifier:C. Agee, UNM
Type spec mass (g):18
Type spec location:UNM
Main mass: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. 100, MAPS 49, E1-E101 (2014)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Institute of Meteoritics UNM   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1405 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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