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Northwest Africa 8705
Basic information Name: Northwest Africa 8705
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8705
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 6.2 g
Meteoritical Bulletin:  MB 103  (2014)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Dec 2014
Writeup from MB 103:

Northwest Africa 8705 (NWA 8705)

(Northwest Africa)

Purchased: 2014 Oct

Classification: Martian meteorite (Shergottite)

History: Purchased by Stefan Ralew in October 2014 from a dealer in Zagora, Morocco, subsequently acquired by the Planetary Studies Foundation (PSF).

Physical characteristics: Very fresh specimen (6.2 g) partly coated by black fusion crust and crosscut by some vesicular glass veins. Mostly very pale green in color with small black opaque grains and evident glassy maskelynite.

Petrography: (A. Irving and S. Kuehner, UWS) Porphyritic texture. Anhedral olivine macrocrysts (up to 1.8 mm, some with partial pigeonite rims) are set in a finer grained groundmass of predominantly zoned pigeonite and maskelynite with minor olivine, Mg-bearing merrillite, chromite (with variable Ti contents), Cr-bearing ilmenite and Ni-bearing pyrrhotite.

Geochemistry: Olivine macrocrysts (Fa30.7-34.7, FeO/MnO = 50-56, N = 3), groundmass olivine (Fa38.4, FeO/MnO = 54), pigeonite rim on olivine (Fs24.6Wo7.6, FeO/MnO = 32), pigeonite (Fs25.3-33.3Wo8.1-7.4, FeO/MnO = 29-36, N = 3), plagioclase (An59.7-62.4Or1.5-1.8, N = 3).

Classification: Martian (shergottite, olivine-phyric).

Specimens: 1.3 g including one polished thick section at UWB. The main mass is held by PSF.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2014 Oct
Mass (g):6.2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):30.7-38.4
Ferrosilite (mol%):24.6-33.3
Wollastonite (mol%):7.4-8.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):1.3
Type spec location:UWB
Main mass:PSF
Comments:RA10-2; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Ralew: Stefan Ralew, Kunibertstra├če 29, 12524 Berlin, Germany; 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
Find references in NASA ADS:
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     This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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