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Northwest Africa 15661
Basic information Name: Northwest Africa 15661
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15661
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1124 g
Classification
  history:
Recommended:  CK5    [explanation]

This is 1 of 202 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 23 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15661 (NWA 15661)

(Northwest Africa)

Purchased: 2022

Classification: Carbonaceous chondrite (CK5)

History: The meteorite was purchased from a meteorite dealer in Morocco.

Physical characteristics: Dark brownish rock without fusion crust.

Petrography: The meteorite displays a dark grayish interior and is composed of well defined separated chondrules (apparent mean diameter about 800 µm) in recrystallized matrix. Predominant mineral phase is Fe-rich, Ni-bearing olivine. Subordinate are low-Ca pyroxene, diopside, intermediate plagioclase, and minor pentlandite. Cr-rich magnetite is abundant; no CAIs detected.

Geochemistry: olivine: Fa30.7±0.2 (Fa30.3-31.1, FeO/MnO=133±13; NiO=0.76±0.03 wt%, n=10); low-Ca pyroxene: Fs25.4±0.4Wo0.7±0.2 (Fs24.4-25.9Wo0.6-1.2, n=15); Ca-pyroxene: Fs5.1±2.4Wo39.1±1.8 (Fs1.7-10.3Wo35.3-41.5, n=10); feldspar: An19.3-34.5Ab62.6-73.7Or2.1-6.9, n=10; magnetite contains 4.57±0.05 wt% Cr2O3, n=7

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):1124
Pieces:1
Class:CK5
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):30.7
Ferrosilite (mol%):25.4; 5.1
Wollastonite (mol%):0.7; 39.1
Classifier:A. Greshake, MNB
Type spec mass (g):22.9
Type spec location:MNB
Main mass:Mateusz Szyszko
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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