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Northwest Africa 12458 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12458 This is an OFFICIAL meteorite name. Abbreviation: NWA 12458 Observed fall: No Year found: 2005 Country: (Northwest Africa) Mass: 249 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 62 approved meteorites classified as L3-6. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: | Approved 2 Aug 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 12458 (NWA 12458) (Northwest Africa) Purchased: 2005 Classification: Ordinary chondrite (L3-6) History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by the Hollis Collection and then donated to PSF. Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Breccia composed of well-formed chondrules (apparent diameter 810±410 µm, N = 20) plus some angular Type 5 and Type 6 clasts in a finer grained matrix containing stained metal, merrillite and chlorapatite. Geochemistry: Olivine (Fa19.7±8.0, range Fa6.3-27.1, N = 7; Cr2O3 in ferroan examples 0.02-0.08 wt.%, mean 0.04±0.03 wt.%, N = 3), orthopyroxene (Fs12.9±8.7Wo0.9±1.1, range 3.4-20.5Wo0.3-2.1, N = 3), clinopyroxene (Fs4.1-9.4Wo36.7-43.2, N = 2), olivine in Type 6 lithic clast (Fa25.0±0.0, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.67. Classification: Ordinary chondrite (L3-6 breccia). Affinity to L chondrites is established from olivine composition in equilibrated lithic clasts and bulk magnetic susceptibility. Specimens: The entire specimen including one polished thin section is at PSF. | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections |
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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