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Northwest Africa 12594
Basic information Name: Northwest Africa 12594
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12594
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 150 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 189 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 15 May 2019
Writeup from MB 108:

Northwest Africa 12594 (NWA 12594)


Purchased: 2018

Classification: Martian meteorite (Shergottite)

History: Found in Algeria in 2018 and purchased from a Moroccan dealer by Huapei Wang in 2018

Physical characteristics: These stones are (partially) covered by black fusion crust and appear to be very fresh and unaltered. Numerous vesicles are seen in the fusion crust. The interior is composed of yellow green grains with interstitial pale gray grains.

Petrography: The rock has a medium-grained subophitic texture. It consists of elongated prismatic pyroxene (up to 1.5 mm in length) and lath-like plagioclase (up to 1.8 mm in length), with accessory titanomagnetite, ilmenite, silica polymorph, merrillite, pyrrhotite, fayalite. Pyroxenes show patchy zoning from Mg-rich core to Mg-poor rim, with irregular boundaries. Ilmenite occurs as thin lamellae intergrown with titanomagnetite.

Geochemistry: Pyroxenes are zoned from augite cores (En45.3Wo25.6, FeO/MnO = 28.5) and pigeonite cores (En40.3Wo19.6 FeO/MnO = 32.3) to ferropigeonite rims (En8.4Wo14.5 FeO/MnO = 41.1). Plagioclase is characterized by homogeneous compositions of An52 Or1.4. Titanomagnetite (TiO2 29.4 wt%, FeO 65.5 wt%, Al2O3 1.3 wt%); ilmenite (TiO2 48.9 wt%, FeO 49.8 wt%).

Data from:
  Table 0
  Line 0:
Date:P 2018
Mass (g):150
Class:Martian (shergottite)
Weathering grade:low
Wollastonite (mol%):25.6-14.5
Classifier:T. Cao and H. Wang, CUG
Type spec mass (g):20
Type spec location:CUG
Main mass:Huapei Wang, CUG
Comments:Submitted by Ting Cao, CUG
   and collections
CUG: Planetary Science Institute, School of Earth Sciences China University of Geosciences (Wuhan) 388 Lumo Road, Wuhan, Hubei 430074, P. R. China, China (institutional address; updated 4 Feb 2019)
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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     This is 1 of 961 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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