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Northwest Africa 13176 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13176 This is an OFFICIAL meteorite name. Abbreviation: NWA 13176 Observed fall: No Year found: 2019 Country: Algeria Mass: 223 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 520 approved meteorites classified as Diogenite. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 28 Mar 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13176 (NWA 13176) Algeria Find: 2019 Classification: HED achondrite (Diogenite) History: Three samples weighing (91.79, 56.39, 74.3 7g) were found in the desert near Tindouf, Algeria, in March 2019. Dave Lehman and a partner acquired the samples from the collector. Physical characteristics: Samples are irregularly shaped and are partially covered with a black, wind-ablated fusion crust. One sample shows flight orientation with weak flow lines and frothy fusion crust covering the crusted portions of the sample. The uncrusted portions with fractured surfaces are light greenish colored. Petrography: Description and classification (A. Love, App) Sample is a cataclastic breccia composed of dominant lath-shaped orthopyroxene up to ~9 mm and augite. Additional minerals are (~3 vol%) twinned plagioclase (with an average length of 529µm), chromite, troilite, a silica polymorph and rare K-feldspar (Or98An1.8). Geochemistry: (A. Love, App): Low Ca pyroxene (Fs24.1±0.2Wo2.0±0.5, Fe/Mn=27.6±0.3, Mg#75.4±0.2, n=10); high Ca pyroxene (Fs7.8±0.3Wo45.8±0.4, Fe/Mn=21.7±1.8, n=5); plagioclase (An83.8±2.1Or0.2±0.1, n=3). Classification: HED achondrite (Diogenite). Textures, mineralogy and Fe/Mn ratios of pyroxenes suggest this sample is a diogenite breccia. Weathering grade is low. Specimens: Dave Lehman and a partner hold the main masses. An endcut and 2 slices weighing 20.97 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||
Data from: MB109 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) |
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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 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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