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Northwest Africa 13190
Basic information Name: Northwest Africa 13190
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13190
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 49 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 293 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13190 (NWA 13190)

Algeria

Find: 2019

Classification: Martian meteorite (Shergottite)

History: Purchased in 2019 by Miguel Angel Contreras Gomez from a meteorite dealer in Algeria.

Physical characteristics: This sample has a weathered fusion crust exterior, however the interior remains fresh.

Petrography: (D. Sheikh, FSU) Sample is a diabase having a predominantly subophitic texture composed of complexly zoned, tabular and prismatic (sometimes twinned) chadacrysts of subcalcic augite and pigeonite (Av. 330±50 µm, up to 1mm, 60 vol%) contained within larger oikocrysts of maskelynite (Av. 800±100 µm, up to 2 mm, 40 vol%). Accessory phases include titanomagnetite (some Cr rich), ilmenite, silica, Si-Al-K-Na rich glass, merrillite, and pyrrhotite.

Geochemistry: Subcalcic augite (Fs32.3±6.6 Wo30.7±2.3, range Fs21.7-47.7 Wo25.4-35.2, FeO/MnO=34±6, n=37) pigeonite (Fs52.7±8.5 Wo14.4±2.3, range Fs30.6-72.3 Wo10.0-19.3, FeO/MnO=36±4, n=54) maskelynite (An48.9±5.1 Or1.9±1.0, range An41.4-55.7 Or0.3-3.8, n=43).

Classification: Martian (shergottite, diabasic) Silicate chemistry, the presence of maskelynite, FeO/MnO ratios of pyroxenes, and magnetic susceptibility provide support for classification as shergottite. Average grain sizes of pyroxenes and maskelynite larger than that of basaltic shergottites, but smaller than gabbroic shergottites, hence diabasic.

Specimens: 10.02 grams at UCLA; main mass with Miguel Angel Contreras Gomez.

Data from:
  MB109
  Table 0
  Line 0:
Date:2019
Mass (g):49
Pieces:10
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):52.7±8.5, 32.3±6.6
Wollastonite (mol%):14.4±2.3, 30.7±2.3
Magnetic suscept.:3.53
Classifier:D. Sheikh, FSU
Type spec mass (g):10.02
Type spec location:UCLA
Main mass:Miguel Angel Contreras Gomez
Comments:Submitted by Daniel Sheikh
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
chen wang   
Cong Wang   
Domjan Svilkovic   
Eric Escrich   
Ryan Upchurch   
Public domain photographs:
Daniel Sheikh   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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