Meteoritical Bulletin: Entry for Northwest Africa 12396

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Northwest Africa 12396

Basic information

Name: Northwest Africa 12396
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12396
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 11.3 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Mesosiderite
Recommended:			Mesosiderite [explanation]

This is 1 of 240 approved meteorites classified as Mesosiderite. [show all]
Search for other: Mesosiderites, Metal-rich meteorites

Comments:

Approved 27 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 12396 (NWA 12396)

(Northwest Africa)

Purchased: 2015

Classification: Mesosiderite

Physical characteristics: 2.5 × 1.5 × 2.0 cm in size. Sample is irregular in shape with preserved fusion crust.

Petrography: Composed mainly of Opx and Plg. Opx ranges from 30 to 1480 μm. Plg ranges in size from 30 to 170 μm. FeNi metal ranges from 15 to 1050 μm and sulfides from 30 μm to 350 μm. Opaques comprise approximately 20% of sample. Weakly shocked: plagioclase displays minor undulose extinction and no melt veins or melt pockets are visible. Moderately weathered: Fe Oxide veining common.

Geochemistry: Low Ca pyroxene: Fs_30.2±0.3Wo_3.0±0.6, FeO/MnO=27.7±0.8 n=48; feldspar: An_91.3±2.1Ab_8.4±2.0n=13. Oxygen isotopes (Ziegler, UNM): δ¹⁷O = 1.689±0.23, δ¹⁸O = 3.745±0.42, Δ¹⁷O = -0.289±0.01 per mil (n=3)

Classification: Mesosiderite

Specimens: Catalogued at the ROM as LM57787

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson Gem and Mineral Show
Date:	P 2015
Mass (g):	11.26
Pieces:	1
Class:	Mesosiderite
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	30.20± 0.34
Wollastonite (mol%):	3.00± 0.62
Classifier:	V. Di Cecco, ROM
Type spec mass (g):	2.51
Type spec location:	ROM
Main mass:	DGregory
Comments:	Submitted by V. Di Cecco (ROM)

Plots:

O isotopes:

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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