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Northwest Africa 14770
Basic information Name: Northwest Africa 14770
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14770
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 844 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 292 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 6 Aug 2022
Writeup from MB 111:

Northwest Africa 14770 (NWA 14770)

(Northwest Africa)

Purchased: 2021

Classification: Martian meteorite (Shergottite)

History: Purchased by Rob Wesel from a meteorite dealer in Algeria, 2021.

Physical characteristics: Sawcut surfaces reveal a relatively fine-grained rock of with dark green, dark brown, and light-colored grains. No significant shock melt veins were observed.

Petrography: (C. Agee, UNM) Electron microprobe analysis and reflected light microscopy of a polished mount show this meteorite to be an olivine-phyric igneous rock with subophitic texture. Pyroxenes and olivines show core to rim zonation that reflect igneous crystallization and iron enrichment trends. Plagioclase has been converted to maskelynite. Minor amounts of chromite, Cr-Ti spinel, Ti-Cr magnetite, ilmenite, Cl-rich apatite, and merrillite were detected.

Geochemistry: (A. Ross, UNM) Olivine Fa55.6±9.2, core to rim Fa48-76, Fe/Mn=54±2, n=9; pigeonite Fs43.5±11.9Wo13.9±4.3, Fe/Mn=33±3, n=11; subcalcic augite Fs23.0±8.2Wo35.2±4.3, Fe/Mn=31±3, n=2; plagioclase An59.9±6.8Ab39.3±6.1, n=7.

Classification: Martian, olivine-phyric shergottite. Pyroxene crystallization trends are similar to NWA 1110, however this meteorite is significantly more ferroan than typical olivine-phyric shergottites, in particular the olivines have unusually high fayalite contents.

Specimens: 23 g on deposit at UNM, Craig Zlimen holds 40 g, Rob Wesel holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):844
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):55.6±9.2
Ferrosilite (mol%):43.5±11.9, 23.0±8.2
Wollastonite (mol%):13.9±4.3, 35.2±4.3
Classifier:C. Agee, UNM
Type spec mass (g):23
Type spec location:UNM
Main mass:Rob Wesel
Comments:RW-2; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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