Meteoritical Bulletin: Entry for Northwest Africa 15766

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Northwest Africa 15766

Basic information

Name: Northwest Africa 15766
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15766
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 287 g

Classification
history:

Meteoritical Bulletin:	MB 112	(2023)	LL6-melt breccia
Recommended:			LL6-melt breccia [explanation]

This is 1 of 22 approved meteorites classified as LL6-melt breccia. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 19 Mar 2023

Writeup

Writeup from MB 112:

Northwest Africa 15766 (NWA 15766)

(Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (LL6, melt breccia)

Petrography: (K. Metzler, IfP) Ordinary chondrite melt breccia, consisting of mm- to cm-sized chondritic lithic clasts, embedded in a dark crystallized melt. The chondritic clasts are strongly recrystallized; secondary plagioclase grains mostly >50 µm.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition in clasts is Fa_30.7±0.4(Fa_30.2-31.5; n=10). The mean low-Ca pyroxene composition in clasts is Fs_24.5±0.4Wo_2.0±0.2(Fs_24.2-25.3Wo_1.7-2.4; n=8) with a mean CaO concentration of 1.0±0.1 (0.9-1.2) wt%.

Classification: LL chondrite based on mineral chemistry. Petrologic type based on the equilibrated state of olivine and pyroxene, and large grain size of secondary plagioclase.

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2020
Mass (g):	287
Pieces:	1
Class:	LL6-melt breccia
Shock stage:	C-S3
Weathering grade:	W2
Fayalite (mol%):	30.7±0.4
Ferrosilite (mol%):	24.5±0.4
Wollastonite (mol%):	2.0±0.2
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Gregor Pacer, Bad Bellingen, Germany
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 112, in preparation (2023)

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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 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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