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:

Recommended:

Martian (shergottite) [explanation]

This is 1 of 307 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 Meteoritical Bulletin, no. 111, in preparation (2022)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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