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Northwest Africa 8142 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8142 This is an OFFICIAL meteorite name. Abbreviation: NWA 8142 Observed fall: No Year found: 2010 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 31 approved meteorites classified as L5-melt breccia. [show all] Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||
Comments: | Approved 10 Dec 2013 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 102:
Northwest Africa 8142 (NWA 8142) (Northwest Africa) Purchased: 2010 Classification: Ordinary chondrite (L5, melt breccia) History: Three mostly crusted stones weighing 12 g were found and purchased in Agadir in 2009. Greg Catterton acquired the sample from a meteorite prospector in 2010. Physical characteristics: Black shiny fusion crust covers 95% of the rounded ellipsoidal stones. Fusion crusted surfaces display contraction cracks. Petrography: (A. Love, App): Sample is light greenish-gray and displays a brecciated macro-texture composed of clasts of very fine-grained (<20 μm), porphyritic-textured melt embaying areas and clasts of recrystallized chondritic rock. Melt is composed of ~19 μm zoned and unzoned, euhedral olivine grains with 205-305 μm melted and partially melted olivine phenocrysts and 0.2 - 1.3 mm rounded nodules of cellular-textured FeNi and FeS set within a silicate glass. Chondritic rock is composed of: ~400 μm angular clasts of metamorphosed chondritic material, 300 μm mineral grains and few relict chondrules (~605 μm) set within a recrystallized matrix of clastic debris. Geochemistry: Chondritic lithology Fa23.5±0.9 (N=7), Fs19.9±0.6 (N=6), An12.2±2.0 (N=5). Unmelted phenocrysts Fa24.3±0.7 (N=5). Microporphyry Fa11.7±5.1 (N=18) Classification: L5 Impact melt rock Specimens: 2.4 g and 2 polished thin sections are on deposit at App | ||||||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |