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Northwest Africa 7299 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7299 This is an OFFICIAL meteorite name. Abbreviation: NWA 7299 Observed fall: No Year found: 2011 Country: Morocco Mass: 20 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 59 approved meteorites classified as Brachinite. [show all] Search for other: Brachinites, Primitive achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 27 Jul 2012 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 101:
Northwest Africa 7299 (NWA 7299) Morocco Purchased: 2011 Sept Classification: Primitive achondrite (Brachinite) Petrography: (P. Strickland, UAb). Petrographic microscope examination of a thin section shows 80% olivine, 10% orthopyroxene, 5% augite, 5% opaques and metals, and trace plagioclase. Opaques are dominanted by Fe-sulfides, with minor chromite. Olivine has irregular fractures and some grains display undulatory extinction. Most grains have prominent triple junctions. Consistent rusty-staining and oxidized metals indicate weak to moderate weathering. Medium-coarse grained equigranular matrix. Geochemistry: (C. Herd and P. Strickland, UAb). Olivine Fa29.6±0.1, Fe/Mn=61.0; Low-Ca pyroxene Fs25.2±2.3, Wo2.2±0.1, Fe/Mn=40.5; Augite Fs9.9±0.2, Wo43.9±0.4, Fe/Mn=27.2; Chromite Cr#=0.981, Mg#=0.143, TiO2=1.05±0.09 wt%. Classification: Brachinite Specimens: 4.0 g type specimen, including polished thin section, are on deposit at UAb. | ||||||||||||||||||||||||||||||
Data from: MB101 Table 0 Line 0: |
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Institutions and collections |
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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