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Northwest Africa 3170
Basic information Name: Northwest Africa 3170
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3170
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 60 g
Meteoritical Bulletin:  MB 101  (2012)  Lunar (gabbro)
Recommended:  Lunar (gabbro)    [explanation]

This is 1 of 11 approved meteorites classified as Lunar (gabbro).   [show all]
Search for other: Lunar meteorites
Comments: Approved 30 Oct 2012
Writeup from MB 101:

Northwest Africa 3170 (NWA 3170)

(Northwest Africa)

Purchased: 2007 Apr

Classification: Lunar meteorite (gabbro)

History: Purchased from a Moroccan dealer in 2007 by Stefan Ralew.

Physical characteristics: A single 60 g stone consisting of large clasts of yellowish-green gabbro (containing fine, black shock veinlets) in a darker fragmental matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Monomict breccia consisting of ferroan gabbro clasts and related debris. Predominantly composed of olivine, clinopyroxenes and anorthite with accessory fayalite, silica, ilmenite and minor K-Ba-feldspar. Symplectitic intergrowths of hedenbergite+fayalite+silica are present. No orthopyroxene found.

Geochemistry: Olivine (Fa29.6-39.9, FeO/MnO = 82-116), pigeonite (Fs42.3Wo11.9, FeO/MnO = 79), subcalcic augite (Fs28.7Wo26.2, FeO/MnO = 57), subcalcic ferroaugite (Fs64.4-78.8Wo26.3-26.2, FeO/MnO = 78-93). Bulk composition (R. Korotev, WUSL): mean values from INAA of subsamples are 20.7 wt.% FeO, 40 ppm Sc, 56 ppm Co, 110 ppm Ni, 24.3 ppm La, 11.2 ppm Sm, 0.76 ppm Eu, 8.1 ppm Yb, 4.3 ppm Th.

Classification: Lunar (mare gabbro breccia). This stone is very similar in mineralogy and bulk composition to NWA 7007, and both specimens are likely paired with NWA 773.

Specimens: 12.1 g is on deposit at UWS. The remaining material is held by Ralew.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2007 Apr
Mass (g):60
Class:Lunar (gabbro)
Shock stage:low
Weathering grade:low
Fayalite (mol%):29.6-39.9; 98.4
Ferrosilite (mol%):28.7; 64.4-78.8; 42.3
Wollastonite (mol%):26.2; 26.3-26.2; 11.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.1
Type spec location:UWB
Main mass:S. Ralew
Comments:Submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
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. 101, MAPS 50, 1661, September 2015
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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