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Northwest Africa 10170
Basic information Name: Northwest Africa 10170
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10170
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 307 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 18 Jul 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 10170 (NWA 10170)

(Northwest Africa)

Purchased: Jan 2015

Classification: Martian meteorite (Shergottite)

History: The sample was discovered near the Moroccan-Algerian frontier and purchased at the Tucson salon from an anonymous Moroccan dealer.

Physical characteristics: Three crusted stones with a general similarity to NWA 2990 when cut. The type specimen includes pieces of all three stones.

Petrography: (R. Hewins, S. Pont, B. Zanda, MNHNP) Olivine occurs as euhedral to subhedral microphenocrysts and zoned phenocrysts, 100 μm to 1.5 mm in size. They contain melt and pyroxene inclusions. Olivine is set in a mesostasis of prismatic to subophitic pyroxene and feldspar, with a texture similar to those of NWA 2990 and NWA 6234. Chromite is the main accessory mineral. The "feldspar" is almost entirely free of fractures and is continuous like glass between the pyroxene grains. It is presumed to be maskelynite because it looks the same as glass identified as maskelynite by Raman spectroscopy in NWA 10171.

Geochemistry: Mineral compositions and Geochemistry: (R. Hewins, MNHNP) The olivine composition is Fo67.2±7.7 (Fa20-42), with an FeO/MnO ratio of 52.1. The pigeonite composition is En69Fs28Wo 4 to En52Fs29Wo19, with average core composition En65.8±1.5 and the atomic Fe/Mn ratio 31.9. Spinel contains 28-54 wt% Cr2O3. Stoichiometric An55-48Ab43-50Or2 is free of fractures and apparently glass (maskelynite). Mineral compositions resemble those of NWA 6234 (Gross et al., 2012) but the latter has more calcic plagioclase (An65-58).

Classification: (R. Hewins and B. Zanda, MNHNP) The meteorite has SNC Fe/Mn ratios and is classified as an olivine-phyric shergottite.

Bibliography:
  • J. Gross, J. Filiberto, A.H. Treiman, C.D.K. Herd, M. Melwani Daswani and S.P. Schwenzer (2012) Petrography, mineral chemistry, and crystallization history of olivine-phyric shergottite NWA6234: a new intermediate melt composition. 43rd Lunar and Planetary Science Conference, LPI Contribution No. 1659, id.2693 (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Jan 2015
Mass (g):307
Pieces:3
Class:Martian (shergottite)
Shock stage:high
Fayalite (mol%):32.8±7.7 (20-42)
Ferrosilite (mol%):29.1±1.1
Wollastonite (mol%):7.9±6.3
Classifier:R. Hewins and B. Zanda, MNHNP
Type spec mass (g):20
Type spec location:MNHNP
Main mass:Labenne Meteorites
Comments:Temporary name LM 200215 Q.; submitted by R. Hewins, MNHNP
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
LPI: Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, TX 77058 , United States (institutional address; updated 10 Jul 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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