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Northwest Africa 7824 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7824 This is an OFFICIAL meteorite name. Abbreviation: NWA 7824 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 258 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 14 Nov 2013 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 102:
Northwest Africa 7824 (NWA 7824) (Northwest Africa) Purchased: 2011 Oct Classification: Mesosiderite History: Purchased by Mike Bandli in October 2011 from a dealer in Erfoud, Morocco. Physical characteristics: Exceptionally fresh specimen (59 g) with evident metal, sulfide and honey-yellow silicate grains. Petrography: (A. Irving and S. Kuehner, UWS) Metamorphosed breccia composed of larger, angular monomineralic (and some polymineralic) clasts in a recrystallized matrix of related crystal debris. Composed of abundant orthopyroxene with interstitial anorthitic plagioclase, holly leaf-shaped grains of kamacite (~ 8 vol.%), Fe-sulfide (~ 4 vol.%), taenite, chromite and Na-bearing merrillite. The only evidence of terrestrial weathering is very slight staining on some fractures in pyroxene. Geochemistry: Orthopyroxene (Fs26.2-26.3Wo1.9-1.5; FeO/MnO = 29-31). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed silicate material by laser fluorination gave, respectively: δ17O = 1.708, 1.684 δ18O = 3.757, 3.718; Δ17O = -0.276, -0.279 (all per mil). Classification: Mesosiderite. Specimens: 12 g of material and one polished thin section are at UWB. The remaining material is held by Mr. M. Bandli. | ||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||
Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012) |
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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 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names) |