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Northwest Africa 15497
Basic information Name: Northwest Africa 15497
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15497
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 11.9 g
Meteoritical Bulletin:  MB 111  (2023)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Dec 2022
Writeup from MB 111:

Northwest Africa 15497 (NWA 15497)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (Shergottite)

History: Purchased by Daoud Wabish in 2020 from a meteorite dealer in Northwest Africa.

Physical characteristics: Single fresh stone with shiny, black fusion crust with melt veins visible.

Petrography: (V. Mugica, CSUF; D. Sheikh, Cascadia) Specimen displays a predominantly subophitic texture comprised of subhedral, compositionally zoned, prismatic and equant pigeonite grains (avg. grain size = 0.38 mm; n=79). Maskelynite is tabular and prismatic (avg. grain size = 0.71 mm; n=54) unzoned and set within a fine-grained matrix that includes accessory chlorapatite, merrillite, titanomagnetite, troilite and silica glass. Melt pockets are sparsely distributed throughout the sample.

Geochemistry: Pigeonite (Fs59.0±15.1Wo17.4±3.4, range Fs32.2-83.9Wo10.9-24.9, Fe/Mn=35±4, n=95), High-Ca Pyroxene (Fs35.8±9.6Wo29.7±3.0, range Fs25.9-60.5Wo25.0-35.0, Fe/Mn=31±4, n=29), Maskelynite (An48.2±4.5Or2.7±1.6, range An40.8-54.1Or1.3-8.4, n=33).

Classification: Martian (shergottite).

Specimens: 2.42 grams at Cascadia, main mass with Daoud Wabish.

Data from:
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 2020
Mass (g):11.88
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):59.0±15.1, 35.8±9.6
Wollastonite (mol%):17.4±3.4, 29.7±3.0
Classifier:V. Mugica, CSUF; D. Sheikh, Cascadia
Type spec mass (g):2.43
Type spec location:Cascadia
Main mass:Daoud Wabish
Comments:CML 1542; submitted by Daniel Sheikh
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
CSUF: California State University, Fullerton 800 N. State College Blvd. Fullerton, CA 92831-3599, United States (institutional address; updated 15 Jul 2023)
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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Public domain photographs:
Daniel Sheikh   

     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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