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Northwest Africa 13990 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13990 This is an OFFICIAL meteorite name. Abbreviation: NWA 13990 Observed fall: No Year found: 2010 Country: (Northwest Africa) Mass: 69 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 451 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
Comments: | Approved 29 Jun 2021 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 13990 (NWA 13990) (Northwest Africa) Purchased: 2010 Dec Classification: HED achondrite (Howardite) History: Purchased from a Moroccan mineral dealer at the mineral show in Hamburg, Germany Petrography: (K. Metzler, IfP) Achondritic clast-rich melt rock consisting of lithic clasts (up to several cm in diameter) and mineral fragments (pyroxene and plagioclase), which are embedded in a crystallized melt. The melt matrix consists of pyroxene and plagioclase crystals with an ophitic texture. Diogenitic pyroxenite clasts and eucritic clasts with gabbroic texture were found. Most clasts are moderately to strongly recrystallized. Small grains of Ni-bearing metal and olivine are dispersed in the melt matrix. Geochemistry: Mineral compositions and geochemistry: Pyroxene in eucrite clast: Fs31±1.1Wo8.5±1.6 (Fs29.8-32.8Wo6.9-12.4); mean Fe/Mn (at.): 28.3; n=10. Plagioclase in eucrite clast: An83.0±5.3Or0.3±0.2 (An75.3-89.3Or0.0-0.7); n=11. Pyroxene in diogenite clast: Fs22.7±2.3Wo2.3±0.4 (Fs19.4-25.3Wo1.7-3.1); mean Fe/Mn (at.): 28.9; n=11. Olivine grains: Fa39.8±4.0 (Fa33.8-43.9); Fe/Mn (at.): 53.6; n=8.; Classification: Howardite (clast-rich melt rock) with diogenitic (~60 vol%) and eucritic (~40 vol%) components. | ||||||||||||||||||||||||||||||
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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Photos: |
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Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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