Meteoritical Bulletin: Entry for Northwest Africa 13707

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Northwest Africa 13707

Basic information

Name: Northwest Africa 13707
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13707
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 26.7 g

Classification
history:

Meteoritical Bulletin:	MB 110	(2022)	CM2
Recommended:			CM2 [explanation]

This is 1 of 641 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Approved 8 Apr 2021

Writeup

Writeup from MB 110:

Northwest Africa 13707 (NWA 13707)

(Northwest Africa)

Purchased: 2020 Feb

Classification: Carbonaceous chondrite (CM2)

Physical characteristics: Many dark sub-gram specimens, some with fusion crust, and a ~15 g main mass with some fusion crust as well

Petrography: (J. Gattacceca, CEREGE) Chondrules (average apparent diameter 290±150 µm, n=30) set in an abundant (74 vol%, by point counting, N=227) fine-grained, iron-rich matrix. Sulfide and rare metal.

Geochemistry: Olivine Fa_14.4±15.9, range Fa_0.6-44.4(n=6). Cr₂O₃ in ferroan olivine 0.36±0.04 wt% (n=4). Low-Ca pyroxene, 3 analyses: Fs_1.7Wo_1.3, Fs_1.6Wo_4.1, Fs_40.5Wo_0.3.Defocused matrix analyses FeO = 30.8 wt%, analytical total 77.1 wt% (n=1). The low total reveals the presence of hydrous phases in the matrix.

Classification: Carbonaceous chondrite (CM2).

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Zagora, Morocco
Date:	P 2020 Feb
Mass (g):	26.7
Pieces:	many
Class:	CM2
Weathering grade:	low
Fayalite (mol%):	14.4±15.9 (n=6)
Ferrosilite (mol%):	1.7 (n=2)
Wollastonite (mol%):	2.7
Classifier:	J. Gattacceca, CEREGE
Type spec mass (g):	5.5
Type spec location:	CEREGE
Main mass:	Kuntz
Finder:	anonymous
Comments:	work name K485; submitted by Jérôme Gattacceca

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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