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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:help 26.7 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 602 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
Writeuphelp
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 Fa14.4±15.9, range Fa0.6-44.4 (n=6). Cr2O3 in ferroan olivine 0.36±0.04 wt% (n=4). Low-Ca pyroxene, 3 analyses: Fs1.7Wo1.3, Fs1.6Wo4.1, Fs40.5Wo0.3. 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 29 Oct 2018)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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