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| Northwest Africa 14176 | |||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 14176 This is an OFFICIAL meteorite name. Abbreviation: NWA 14176 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass:  310 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 15 approved meteorites classified as Eucrite-an. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
| Comments: | Approved 6 Oct 2021 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 14176 (NWA 14176) (Northwest Africa) Purchased: 2020 Sep Classification: HED achondrite (Eucrite, anomalous) History: Purchased by Luc Labenne in September 2020 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Porphyritic texture. Relatively large (up to 1 cm long), subhedral prismatic macrocrysts of exsolved pigeonite (pale orange-tan in thin section) are set in a finer grained groundmass composed of parallel-intergrown pigeonite and calcic plagioclase together with accessory silica polymorph, Ti-chromite, ilmenite, merrillite, troilite and baddeleyite. The macrocrysts consist of host low-Ca pyroxene with augite exsolution lamellae, but they also contain abundant thin (1-2 μm) exsolution lamellae of chromite and arrays of blebby plagioclase distributed along both rational and irrational crystallographic planes. Geochemistry: Macrocryst low-Ca pyroxene host (Fs47.0-51.0Wo1.5-1.9, FeO/MnO = 32-33, N = 3), augite exsolution lamellae (Fs20.3-22.7Wo43.1-44.2, FeO/MnO = 27-29, N = 3), groundmass low-Ca pyroxene (Fs51.0-54.4Wo1.5-3.4, FeO/MnO = 30-31, N = 2), plagioclase (An82.5-83.0Or1.0-1.8, N = 3). Classification: Eucrite (unbrecciated, pyroxene-phyric, anomalous). This material is identical to and paired with NWA 13355. The porphyritic igneous texture, prominent chromite and plagioclase exsolution in pyroxenes, and atypical oxygen isotopic composition (for NWA 13355) are anomalous features. Specimens: 20.4 g including one polished thin section at UWB; remainder with Labenne. | ||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Institutions and collections |
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) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012) |
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| Catalogs: |
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| References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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| Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||
| Crosslinks: |
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| Revision history: |
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