Meteoritical Bulletin: Entry for Northwest Africa 12335

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Northwest Africa 12335

Basic information

Name: Northwest Africa 12335
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12335
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 3.97 kg

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 6 Dec 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 12335 (NWA 12335)

(Northwest Africa)

Purchased: 2018

Classification: Martian meteorite (Shergottite)

History: Purchased in Guelmim, Morocco by Ali Fettouh in July 2018

Physical characteristics: Six identically appearing pieces with the following weights: 2290 g, 1486 g, 170 g, 20.7 g, and 2 smaller fragments of 4 g. No fusion crust. Broken surface reveals a mix of brown pyroxene grains and black maskelynite domains and shock melt.

Petrography: (C. Agee, UNM) The two major phases in this meteorite are clinopyroxene and maskelynite. The pyroxene compositions range from pigeonite to sub-calcic augite to ferro-pigeonite with a modal abundance of approximately 60%, and significant core to rim zoning in backscatter electron images. Maskelynite has modal abundance of approximately 35%.

Geochemistry: (C. Agee, UNM) Pigeonite Fs_48.0±10.7Wo_16.8±6.0, Fe/Mn=35±3, n=8; sub-calcic augite Fs_29.4±3.9Wo_34.7±2.1, Fe/Mn=32±2, n=4; ferro-pigeonite Fs_81.8±1.9Wo_13.7±1.4, Fe/Mn=36±3, n=8: maskelynite An_48.2±6.0Ab_49.6±4.5Or_2.2±1.7, n=10; alkali feldspar An_3.8Ab_24.1Or_72.1, n=1.

Classification: Evolved Martian basalt, pyroxene trends are similar to QUE 94201.

Specimens: 20.7 g including a probe mount on deposit at UNM. The 2290g main mass is co-owned by Ali Fettouh and John Higgins.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2018
Mass (g):	3970.7
Pieces:	6
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	48.0±10.7, 29.4±3.9, 81.8±1.9
Wollastonite (mol%):	16.8±6.0, 34.7±2.1, 13.7±1.4
Classifier:	C. Agee, UNM
Type spec mass (g):	20.7
Type spec location:	UNM
Main mass:	Ali Fettouh and John Higgins
Comments:	Field name Z-2; 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 Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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