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Northwest Africa 15200
Basic information Name: Northwest Africa 15200
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15200
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 196 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Martian (nakhlite)
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 32 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 5 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15200 (NWA 15200)

Algeria

Purchased: 2022

Classification: Martian meteorite (Nakhlite)

History: Purchased from Jaoud Chaoui in 2022.

Physical characteristics: Exterior covered in dark fusion crust. Broken surface shows a mix of green, orange-brown, and cream-colored grains. Friable.

Petrography: (A. Ross and C. Agee, UNM) This meteorite is an augite-rich cumulate rock with ferro-hypersthene, fayalitic olivine, andesine plagioclase, Al-K-rich mesostasis, Ti-Cr magnetite, ilmenite, and troilite. Augite grains can be more than millimeter in size, as are the olivine grains. Augite is weakly zoned. Ferro-hypersthene commonly occurs as a separate phase, but also as ferroan rims on some augite grains. Olivines are relatively uniform in composition with no igneous zoning present. Plagioclase and mesostasis typically occupy interstitial spaces between larger pyroxene and olivine grains. Maskelynite is absent.

Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa71.8±1.2, Fe/Mn=49±1, CaO=0.42±0.05, (wt%), n=10; augite Fs28.8±5.5Wo38.5±1.7, Fe/Mn=35±1, n=13; ferro-hypersthene Fs57.4±0.8Wo3.0±4.5, Fe/Mn=36±2, n=7; plagioclase An35.7±2.4Ab60.9±2.0, n=10; mesostasis SiO2=60.0±2.7, Al2O3=16.0±1.1, TiO2=1.0±0.7, FeO=8.0±2.9, CaO=0.8±0.3, Na2O=2.1±0.4, K2O=8.9±2.1 (all wt%), n=6.

Classification: Martian nakhlite. Pyroxene compositions in this nakhlite are similar to those in NWA 998, however they are not paired, as NWA 998 lacks significant mesostasis (Treiman, 2005).

Specimens: 21.4 g on deposit at UNM, Mark Lyon holds the main mass which is a 24 g fragment plus another 50 g in smaller fragments, Topher Spinnato and Sean Mahoney also hold approximately 50 g each in smaller fragments.


Bibliography:
  • Treiman A.H. (2005) The nakhlite meteorites: Augite-rich igneous rocks from Mars. Geochemistry 65, 203–270 (link)
Data from:
  MB111
  Table 0
  Line 0:
Date:P 2022
Mass (g):196
Pieces:Many
Class:Martian (nakhlite)
Shock stage:low
Weathering grade:low
Fayalite (mol%):71.8±1.2
Ferrosilite (mol%):28.8±5.5, 57.4±0.8
Wollastonite (mol%):38.5±1.7, 3.0±4.5
Classifier:C. Agee, UNM
Type spec mass (g):21.4
Type spec location:UNM
Main mass:Mark Lyon
Comments:Fieldname ML-37; submitted by C. Agee
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
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Revision
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