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Northwest Africa 11299 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11299 This is an OFFICIAL meteorite name. Abbreviation: NWA 11299 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 199 approved meteorites classified as CK5. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites | ||||||||||||||||||||||||||||
Comments: | Approved 28 Jun 2017 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 106:
Northwest Africa 11299 (NWA 11299) (Northwest Africa) Purchased: 2017 Classification: Carbonaceous chondrite (CK5) History: A single stone weighing 969.7 g was found in Morocco and subsequently purchased by Blaine Reed at the 2017 Tucson Gem and Mineral show. Physical characteristics: The stone is dark-orangish-brown in color, has a flattened ovoid shape, lacks fusion crust and has a weathered exterior with some chondrules protruding through the surface. The cut face showing the interior of the stone is dark greenish-brown and shows readily discernible dark-colored chondrules and irregular to circular dark-gray metallic grains. Petrography: Description and classification (A. Love, App): Sample is recrystallized and has a texture composed of distinct chondrules with an average diameter of 693 μm, chondrule fragments, irregularly shaped CAIs within a fine, transparent crystalline matrix. Olivine chondrules are dominant. Sample contains minor pyroxene, and plagioclase (<50 μm in length) and Cr-magnetite. Geochemistry: Olivine: Fa24.58±0.34 NiO 0.47±0.17, n=20; low Ca pyroxene Fs 21.29±0.67Wo1.02±2.17, n=9; high Ca pyroxene Fs4.77±3.11Wo41.94±6.97, n=2; plagioclase Ab65.01±7.67Or5.93±0.23, n=8; magnetite= Cr2O3 3.40±0.11wt%, Al2O3 0.48±0.23wt%, NiO 0.1±0.07wt% (n=5). Classification: CK5. CK based on dark coloring, presence of CAIs and ubiquitous Cr-magnetite. Petrologic type 5 based on textures and equilibrated mineral compositions. Specimen has low FeO compositions compared to more highly oxidized CK chondrites, but shares compositional similarities to: Graves Nunataks 98102 (CK4 Fa24); NWA 5580 (CK4 Fa25.2); NWA 7615 (CK6 Fa24.7) and NWA 11207 (CK5 Fa24.9). Specimens: Two slices weighing 39.05 g and one polished thin section are on deposit at App. Blaine Reed holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB106 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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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Catalogs: |
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References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |