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Northwest Africa 13658 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13658 This is an OFFICIAL meteorite name. Abbreviation: NWA 13658 Observed fall: No Year found: 2009 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 350 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 10 Jan 2021 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13658 (NWA 13658) (Northwest Africa) Purchased: 2009 June 19 Classification: HED achondrite (Eucrite, polymict) Petrography: (K. Metzler, IfP) Polymict breccia consisting of basalt clasts with subophitic and gabbroic textures, granulite clasts, and mineral fragments (pyroxene, plagioclase) set in a fine-grained clastic matrix made of related debris. The pyroxene shows augite exsolution lamellae. Accessories are ilmenite, chromite, a silica polymorph, troilite, Ni-poor metal, and zircon. Geochemistry: Mineral compositions and geochemistry: Gabbroic clast: Low-Ca pyroxene (host): Fs49.7±0.6 Wo1.8±0.3 (Fs49.0-50.5 Wo1.5-2.3); mean Fe/Mn (at.): 34; n=6. Ca-rich pyroxene (exsolution lamellae) Fs20.3±1.4 Wo42.3±1.9 (Fs19.0-22.6 Wo39.1-44.5); n=6. Plagioclase An87.1±0.7 Or0.3±0.3 (An85.8-87.8 Or0.0-0.7); n=6. Granulite clast: Low-Ca pyroxene (host): Fs57.0±0.6 Wo2.0±0.3 (Fs56.2-57.7 Wo1.6-2.4); mean Fe/Mn (at.): 35; n=5. Ca-rich pyroxene (exsolution lamellae) Fs23.8±0.4 Wo43.2±0.5 (Fs23.1-24.2 Wo42.7-44.0); n=6. Plagioclase An88.5±1.0 Or0.2±0.3 (An87.0-90.0 Or0.0-0.6); n=6. Classification: Polymict eucrite, based on texture, chemical diversity of lithic clasts, mineral compositions, and Fe/Mn ratio of low-Ca 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography: |
Statistics: This is 1 of 7547 approved meteorites from (Northwest Africa) (plus 1970 unapproved names) |