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Northwest Africa 13998 | |||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
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 | ||||||||||||||||||||||||||||||
Writeup![]() |
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: |
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Institutions and collections |
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012) |
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Catalogs: |
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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: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |