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Northwest Africa 11604 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 11604 This is an OFFICIAL meteorite name. Abbreviation: NWA 11604 Observed fall: No Year found: 2016 Country: Algeria Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 392 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||
Comments: | Approved 9 Feb 2018 | ||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Northwest Africa 11604 (NWA 11604) Algeria Purchased: 2016 May 1 Classification: HED achondrite (Howardite) History: Purchased by Miao Bing-an in 2016 from Morocco. Physical characteristics: The medium gray matrix contains a variety of clasts and the fusion crust is not found in this small sample. Petrography (L. Huang, B. Miao, H. Chen, GUT): Breccia containing a variety of basaltic eucrite lithologies (~55 vol%) and cumulate eucrite lithologies (~30 vol%), with ~15 vol% diogenite lithologies. Basaltic eucrite lithologies mostly have a fine-grained recrystallized or subophitic texture. The texture of cumulate eucrite lithologies is equigranular with subequal amounts of pyroxene and plagioclase grains. Diogenite lithologies mostly contain orthopyroxene. Accessories are silica, ilmenite, chromite, troilite. Geochemistry (L. Huang, B. Miao, H. Chen, GUT): Bulk pyroxene: Fe/Mn=30.9; Orthopyroxene of diogenite lithologies: median compositions are Mg#=66.9, Fs32.3Wo2.3 (n=10). Low-Ca pyroxene of cumulate eucrite lithologies: median compositions are Mg#=54.3, Fs44.8Wo2.0 (n=12). Low-Ca pyroxene of basaltic eucrite lithologies: median compositions are Mg#=38.8, Fs59.5Wo2.6 (n=10). High-Ca pyroxene of basaltic eucrite lithologies: median compositions are Mg#=51.6, Fs28.1Wo41.8 (n=8). Plagioclase: median An92.5Or0.3 (n=8). Classification: Polymict brecciated howardite Specimens: 1.2 g and polished thin section are deposited in GUT | ||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 1060 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters) |