Meteoritical Bulletin: Entry for Northwest Africa 15497

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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: 11.9 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 321 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 11 Dec 2022

Writeup

help

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 (Fs_59.0±15.1Wo_17.4±3.4, range Fs_32.2-83.9Wo_10.9-24.9, Fe/Mn=35±4, n=95), High-Ca Pyroxene (Fs_35.8±9.6Wo_29.7±3.0, range Fs_25.9-60.5Wo_25.0-35.0, Fe/Mn=31±4, n=29), Maskelynite (An_48.2±4.5Or_2.7±1.6, range An_40.8-54.1Or_1.3-8.4, n=33).

Classification: Martian (shergottite).

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

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Northwest Africa
Date:	P 2020
Mass (g):	11.88
Pieces:	1
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

Institutions
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)

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:

Credit	Photos
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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