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Northwest Africa 5548 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 5548 This is an OFFICIAL meteorite name. Abbreviation: NWA 5548 Observed fall: No Year found: 2008 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 18 Feb 2012 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 100:
Northwest Africa 5548 (NWA 5548) (Northwest Africa) Purchased: Sept 2008 Classification: Ungrouped achondrite History: Purchased in 2008 September by Thomas Webb from a Moroccan dealer in Erfoud. Physical characteristics: A single dark brown stone weighing 56 g. Petrography: Protogranular texture. Composed predominantly of olivine with accessory clinopyroxene, orthopyroxene, chromite, altered kamacite, and minor chlorapatite and Mg-bearing merrillite. Plagioclase is absent. Geochemistry: Olivine Fa29.9-30.3, Fe/Mn=63-66; clinopyroxene Fs9.8-10.0Wo43.5-43.7, Fe/Mn=33-42; orthopyroxene Fs24.1±0.05Wo2.1-2.2, Fe/Mn=36-40. Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 2.69, 2.72; δ18O = 5.00, 5.08; Δ17O = 0.056, 0.046 per mil. Classification: Achondrite (brachinite-like, ungrouped). Paired with NWA 5400, 6077, 6172, 6292, 6424, 5363, and 6572. Specimens: A total of 2.7 g and one polished thin section are on deposit at UWS; a further 11 g and one thin section are on deposit at BathO. TWebb holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1251: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) TWebb: No contact information provided., United States (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography: |
Statistics: This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |