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| Northwest Africa 14585 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 14585 This is an OFFICIAL meteorite name. Abbreviation: NWA 14585 Observed fall: No Year found: 2021 Country: (Northwest Africa) Mass:  331 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6 approved meteorites classified as Howardite-melt breccia. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
| Comments: |
Approved 19 Mar 2022 Revised 24 Jan 2024: refined classification | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Northwest Africa 14585 (NWA 14585) (Northwest Africa) Purchased: 2021 Jun Classification: HED achondrite (Howardite) History: Purchased by Bala Adi from several Algerian dealers and acquired by Jason Whitcomb in June 2021. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex metal-bearing breccia consisting of silicate clasts of varying size set in a much finer grained, partly vesicular matrix containing kamacite, troilite and ilmenite (all three as composite grains). Silicate grains include diogenitic orthopyroxene, diogenitic olivine, eucritic pigeonite, bytownitic plagioclase and anorthite. The proportions of diogenitic and eucritic material are difficult to estimate accurately, but certainly exceed 10 vol.% each. Silica polymorph, augite, chromite and Fe metal were not observed in the studied slice, but a single 250 µm zoned glass sphere with diogenitic orthopyroxene-like core and pigeonite-like rim was found. Geochemistry: Diogenitic orthopyroxene ( Fs27.4Wo1.0; FeO/MnO = 25-37; N = 2), pigeonite (Fs32.2-35.9Wo8.4-15.5, FeO/MnO = 28-34, N = 4), ferroan pigeonite rim (Fs48.4Wo6.2, FeO/MnO = 28), olivine (Fa41.6-52.5, FeO/MnO = 49-56, N = 3), olivine inclusion in diogenitic orthopyroxene (Fa31.2, FeO/MnO = 45), plagioclase (An82.3-92.5Or0.7-0.2, N = 3), glass sphere core (Fs17.8Wo2.3, FeO/MnO = 37, Al2O3 2.0 wt.%). Classification: Howardite, melt breccia (vesicular). Specimens: 26.4 g in the form of a polished slice at PSF; remainder with Mr. J. Whitcomb. Writeup from MB 113: NWA 14585: reclassification
A. Irving (UWS) notes that this howardite is better classified as a howardite melt breccia | ||||||||||||||||||||||||||||||
| Data from: MB111 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ? Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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| Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
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| Revision history: |
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