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Northwest Africa 13998
Basic information Name: Northwest Africa 13998
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13998
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 31 g
Classification
  history:
Recommended:  CK5    [explanation]

This is 1 of 199 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 21 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13998 (NWA 13998)

(Northwest Africa)

Purchased: 2009 Jun

Classification: Carbonaceous chondrite (CK5)

History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs are embedded in a recrystallized dark gray matrix, which is interspersed with magnetite, troilite, and pentlandite grains. The range of apparent sizes of most chondrules is 300-1300 µm (up to 2.5 mm).

Geochemistry: Mineral compositions and geochemistry: The mean composition of randomly chosen olivine is Fa27.9±0.8 (Fa26.5-29.0; n=13) with mean Ni concentration of 0.3 wt%. Random measurements of pyroxene grains revealed Fs8.0±0.6Wo46.4±0.8 (Fs7.3-9.1Wo45.1-47.8); n=12. The mean composition of feldspar is An39.5±4.7Or3.1±0.7 (An35.9-47.7Or2.1-3.9); n=5. Magnetite is the most abundant opaque phase and shows significant concentrations of elements other than Fe: MgO 0.2-0.5 wt%; Al2O3 2.7-3.0 wt%; TiO2 0.5-0.7 wt%; Cr2O3 6.0-6.2 wt%; NiO 0.1-0.3 wt% (n=3).

Classification: CK chondrite based on mineral chemistry. Petrologic type 5 based on the visibility of chondrules, but equilibrated state of olivine and pyroxene.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2009 Jun
Mass (g):31
Pieces:1
Class:CK5
Shock stage:C-S3
Weathering grade:low
Fayalite (mol%):27.9±0.8
Ferrosilite (mol%):8.0±0.6
Wollastonite (mol%):46.4±0.8
Classifier:K. Metzler, IfP
Type spec mass (g):6.5
Type spec location:IfP
Main mass:Anonymous
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 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
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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