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Northwest Africa 6859
Basic information Name: Northwest Africa 6859
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6859
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 710 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CV3
Recommended:  CV3    [explanation]

This is 1 of 511 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 7 Mar 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 6859 (NWA 6859)

(Northwest Africa)

Purchased: 2010

Classification: Carbonaceous chondrite (CV3)

Petrography: (R. Andreasen, UHou) In thin section, ~55% chondrules of different types (PO, BO, and to a lesser extent POP) with an apparent diameter of about 1 mm, ~3% CAIs of different morphologies, small 1-2 mm irregular CAIs common, larger ~10 mm near spherical CAIs less common, ~1% Fe-Ni sulfide (pentlandite), weathered in places (~10%) and replaced by oxides. Contains ~40% light-gray, fine-grained crystalline matrix that appears fresh. No metal (or replacement products of metal weathering) was observed and no opaque phases were seen in the chondrules studied.

Geochemistry: Mineral Composition and Geochemistry: (R. Andreasen, UHou - EPMA analyses performed on the JSC microprobe) Chondrule olivine Fo98.3±1.5 (Fo93.7-99.8, n=45). Matrix olivine, variable in composition, mean Fo56.6±4.8 (Fo51.3-60.3, n=7). Chondrule pyroxene, En93.5±1.0Fs1.3±0.6Wo4.8±1.0. Sulfides (pentlandite) Ni 18.1±0.6 wt%, Co 0.9±0.1 wt%, (n=19)

Classification: Carbonaceous chondrite (CV3, oxidized subgroup).

Specimens: Thin section at UHou. 20.7 g at the AMSA.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2010
Mass (g):710
Pieces:many
Class:CV3
Shock stage:low
Weathering grade:low
Fayalite (mol%):1.7±1.5
Ferrosilite (mol%):1.3±0.3
Wollastonite (mol%):4.8±0.5
Classifier:R. Andreasen, UHou
Type spec mass (g):20.7
Type spec location:AMSA
Main mass:Gary Fujihara, Hawaii, USA
Finder:unknown
Comments:Submitted by Rasmus Andreasen
Institutions
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
AMSA: Australian Museum, 6 College Street, Sydney, NSW 2010, Australia (institutional address; updated 18 Oct 2011)
UHou: University of Houston, United States (institutional address; updated 27 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Anthony James   
Edward Krikorian   
Gerald Armstrong   
METEORITICON      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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