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Northwest Africa 12882 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12882 This is an OFFICIAL meteorite name. Abbreviation: NWA 12882 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 77 approved meteorites classified as CK6. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites | ||||||||||||||||||||||||||||||||||
Comments: | Approved 20 Oct 2019 | ||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12882 (NWA 12882) (Northwest Africa) Purchased: 2017 Classification: Carbonaceous chondrite (CK6) History: Marc Jost (SJS) acquired a 1214 g stone from Aziz Habibi at the Munich Mineral show in 2017. Physical characteristics: The sample has an irregular, tabular shape and appears to show flight-orientation with a broad flow-lined leading edge. The cut face shows the interior has a chondritic texture of dispersed, dark-colored chondrules in a dark brownish green matrix. Petrography: (Description and Classification A. Love, App) Sample has a chondritic texture showing chondrules and CAIs (up to ~3 mm) set within a recrystallized matrix. Chondrules have an average apparent diameter of 796 μm (n=32) and barred and granular olivine chondrules with igneous rims are dominant. Plagioclase with intermediate composition occurs throughout matrix and has an average long dimension of 64 μm (n=40). Additional minerals are plagioclase, Ca-phosphates and Cr-magnetite containing ilmenite exsolution lamellae and apatite inclusions. Geochemistry: (A. Love, App) Olivine (Fa30.5±0.2, Fe/Mn=115.7±3.1, mean NiO=0.5, N=12), low Ca pyroxene Fs26.3±0.2Wo0.9±0.1, Fe/Mn=26.2±13.2, N=10), high Ca pyroxene (Fs9.4±0.5Wo48.2±0.3, N=5). Classification: Carbonaceous chondrite (CK6) wi-3 C-S2. Based on chondrule size, composition and abundance (~36%) and presence of ubiqiutous CAIs and Cr-magnetite, this is a CK chondrite. Sample is a petrologic type 6 based on equilibrated compositions of chondrules and size of secondary plagioclase. Specimens: Marc Jost (SJS) hold the main mass. A polished mount, a polished thin section and two slices comprise the 25.7 g type specimen. | ||||||||||||||||||||||||||||||||||
Data from: MB108 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) SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |