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Northwest Africa 12223 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12223 This is an OFFICIAL meteorite name. Abbreviation: NWA 12223 Observed fall: No Year found: 2005 Country: (Northwest Africa) Mass: 327 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 100 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 13 Nov 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12223 (NWA 12223) (Northwest Africa) Purchased: 2005 Jun Classification: HED achondrite (Eucrite, melt breccia) History: Purchased from a Moroccan dealer at the mineral show in Sainte-Marie-aux-Mines, France Petrography: (K. Metzler, IfP) Melt breccia, consisting of eucritic basalt clasts (ophitic to subophitic textures) with sizes up to several cm and mineral fragments (pyroxene, plagioclase, silica polymorph), set in a dark matrix. This matrix represents a crystallized melt with subophitic texture consisting of pyroxene and skeletal plagioclase crystals. Melt pockets of partly devitrified glass also occur. Most pyroxene fragments show augite exsolution lamellae. Accessories are ilmenite, chromium spinel, and metal (mostly oxidized). Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene (host; n=10): Fs63.3±0.5Wo2.4±0.3 (Fs62.6-63.9Wo.9-2.8); mean Fe/Mn (at.): 33. Ca-rich pyroxene (exsolution lamellae; n=10) Fs27.8±0.9Wo43.2±0.7 (Fs27.0-30.2Wo41.7-44.0); Plagioclase (n=10): An87.8±1.7 (An84.9-89.9). | ||||||||||||||||||||||||||||
Data from: MB107 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. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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