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Northwest Africa 11300
Basic information Name: Northwest Africa 11300
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11300
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 71.6 g
Meteoritical Bulletin:  MB 106  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Jun 2017
Writeup from MB 106:

Northwest Africa 11300 (NWA 11300)

(Northwest Africa)

Purchased: 2017 Mar

Classification: Martian meteorite (Shergottite)

History: Purchased by Darryl Pitt in March 2017 from a Mauritanian dealer.

Physical characteristics: A single dark stone (71.6 g) partly coated by black fusion crust. The fresh interior exhibits long prismatic grains of grayish-green pyroxene with subordinate interstitial glassy maskelynite and sporadic pockets of black vesicular glass.

Petrography: (A. Irving and S. Kuehner, UWS) Large (up to 12 mm long) prismatic, zoned and twinned pyroxene grains are accompanied by interstitial sheaf-like masses of thin maskelynite laths associated with Fe-bearing merrillite, chlorapatite, ilmenite, titanomagnetite, chromite and fayalite. Some intergrowths of ferrosilite+silica+pyrrhotite are also present.

Geochemistry: Orthopyroxene (Fs23.9Wo3.8, FeO/MnO = 33), pigeonite (Fs28.7Wo7.9, FeO/MnO = 29), subcalcic augite (Fs22.2-38.2Wo31.2-25.6, FeO/MnO = 28-34, N = 3), ferroan pigeonite (Fs51.7-80.7Wo11.7-13.9; Fs69.2Wo19.7; FeO/MnO = 44-49; N = 3), ferrosilite (Fs92.1Wo2.9, FeO/MnO = 87), fayalite (Fa95.2, FeO/MnO = 49), maskelynite (An43.3-43.4Or2.4-2.9, N = 2).

Classification: Martian (shergottite, gabbroic).

Specimens: 14.39 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Mar
Mass (g):71.6
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):95.2
Ferrosilite (mol%):23.9; 28.7; 51.7-80.7; 92.1; 69.2; 22.2-38.2
Wollastonite (mol%):3.8; 7.9; 11.7-13.9; 2.9; 19.7; 31.2-25.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):14.39
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 266; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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