Meteoritical Bulletin: Entry for Northwest Africa 14899

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Northwest Africa 14899

Basic information

Name: Northwest Africa 14899
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14899
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 155 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 9 May 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 14899 (NWA 14899)

(Northwest Africa)

Purchased: 13 March 2022

Classification: Martian meteorite (Shergottite)

History: Purchased on March 13, 2022. by Matthew Stream from Bachir Salek in Algeria.

Physical characteristics: Five stones with slightly weathered fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample displays a gabbroic texture (Av. silicate grain size ~1.1 mm, up to 5.5 mm, n=105) composed of sub-rounded olivine, prismatic and elongate zoned pyroxene (mostly pigeonite, some displaying augite exsolution lamellae), and elongate plagioclase (completely converted into maskelynite) . Accessory phases include Ti-bearing Cr-rich spinel, ilmenite, merrillite, and troilite.

Geochemistry: Olivine (Fa_41.3±1.8, range Fa_38.3-44.1, Fe/Mn=51±2, n=12), Low-Ca Pyroxene (Fs_24.6±1.2Wo_4.9±0.9, range Fs_23.8-25.5Wo_4.3-5.5, Fe/Mn=29±1, n=2), Pigeonite (Fs_29.8±3.6Wo_9.4±2.0, range Fs_25.7-34.4Wo_6.6-14.6, Fe/Mn=31±2, n=20), High-Ca Pyroxene (Fs_22.1±1.1Wo_31.2±1.0, range Fs_21.3-22.8Wo_30.4-31.9, Fe/Mn=26±1, n=2), Plagioclase (An_50.4±4.3Or_2.0±0.3, range An_40.7-53.9Or_1.5-2.8, n=18), Cr-rich Spinel (Cr#=83.3±0.8, Mg#=10.2±0.9, TiO₂ wt. % = 4.9±3.3, n=3).

Classification: Martian (olivine gabbroic).

Specimens: 20.2 g at Cascadia, main mass with Matthew Stream.

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Algeria
Date:	P 13 March 2022
Mass (g):	155
Pieces:	five
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	low
Fayalite (mol%):	41.3±1.8
Ferrosilite (mol%):	24.6±1.2, 29.8±3.6, 22.1±1.1
Wollastonite (mol%):	4.9±0.9, 9.4±2.0, 31.2±1.0
Classifier:	D. Sheikh, Cascadia
Type spec mass (g):	20.2
Type spec location:	Cascadia
Main mass:	Matthew Stream
Comments:	CML 1501; 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)

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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