Meteoritical Bulletin: Entry for Northwest Africa 12679

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Northwest Africa 12679

Basic information

Name: Northwest Africa 12679
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12679
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 4.17 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	H5-melt breccia
Recommended:			H5-melt breccia [explanation]

This is 1 of 40 approved meteorites classified as H5-melt breccia. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 27 Jun 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12679 (NWA 12679)

(Northwest Africa)

Purchased: 2019

Classification: Ordinary chondrite (H5, melt breccia)

History: Purchased by Larry Atkins from Morocco in January 2019.

Physical characteristics: Single stone; saw-cut surfaces reveal a fragmental breccia with melt rock veins crosscutting host chondrite. Metal grains scattered throughout. Oxidation staining visible.

Petrography: (C. Agee, UNM) Microprobe examination shows many melt rock veins crosscutting H5 chondrite domains with texturally equilibrated chondrules and recrystallized matrix. Plagioclase grain size up to 30 μm in diameter. Abundant Fe-Ni metal. Metal and sulfide blebs are present in shock melt veins. Numerous Fe-oxide veinlets are found throughout the meteorite.

Geochemistry: (C. Agee, UNM) Olivine Fa_19.0±0.6, Fe/Mn=38±2, n=10; low-Ca pyroxene Fs_16.5±0.5Wo_1.1±0.5, Fe/Mn=24±4, n=7; shock melt SiO₂=48.9±1.4, TiO₂=0.14±0.02, Al₂O₃=3.0±0.4, Cr₂O₃=0.63±0.08, MgO=29.8±2.0, FeO=13.1±0.5, Mn=0.41±0.01, CaO=2.4±0.4, Na₂O=0.98±0.14, K₂O=0.17±0.03 (all wt%), Fe/Mn=31±1, n=4.

Classification: H5-melt breccia

Specimens: 29.2 g including a probe mount on deposit at UNM, Larry Atkins holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	4171
Pieces:	1
Class:	H5-melt breccia
Shock stage:	S4
Weathering grade:	W2
Fayalite (mol%):	19.0±0.6
Ferrosilite (mol%):	16.5±0.5
Wollastonite (mol%):	1.1±0.5
Classifier:	C. Agee, UNM
Type spec mass (g):	29.2
Type spec location:	UNM
Main mass:	Larry Atkins
Comments:	Field name LA-12; submitted by C. Agee, UNM

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:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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