Meteoritical Bulletin: Entry for Northwest Africa 12415

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Northwest Africa 12415

Basic information

Name: Northwest Africa 12415
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12415
Observed fall: No
Year found: 2014
Country: Morocco
Mass: 632 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 104 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 9 Feb 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12415 (NWA 12415)

Morocco

Purchased: 2014

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Larry Atkins from Morocco in October 2014.

Physical characteristics: Single stone, no fusion crust; exterior shows numerous light-brown clasts set in a dark matrix of shock melt.

Petrography: (C. Agee, UNM) (C. Agee, UNM) Microprobe examination shows basaltic clasts with approximately 60% pyroxene and 35% plagioclase grains most in the range 200-400 μm.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs_60.8±1.4Wo_3.0±1.3, Fe/Mn=31±1, n=7; high-Ca pyroxene Fs_27.4±1.0Wo_42.5±1.2, Fe/Mn=32±2, n=5; plagioclase An_89.4±0.3, n=5.

Classification: Eucrite-melt breccia, eucrite clasts are consistent with type 6 (Takeda and Graham, 1991) showing clear compositional separation of low and high calcium pyroxenes.

Specimens: 22 g including a probe mount on deposit at UNM, Larry Atkins holds the main mass.

Bibliography:

H. Takeda and A.L. Graham (1991) Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust. Meteoritics 26 129-134. (link)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2014
Mass (g):	632
Pieces:	1
Class:	Eucrite-melt breccia
Shock stage:	High
Weathering grade:	Moderate
Ferrosilite (mol%):	60.8±1.4, 27.4±1.0
Wollastonite (mol%):	3.0±1.3, 42.5±1.2
Classifier:	C. Agee, UNM
Type spec mass (g):	22
Type spec location:	UNM
Main mass:	Larry Atkins
Comments:	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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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