|
Northwest Africa 15317 | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 15317 This is an OFFICIAL meteorite name. Abbreviation: NWA 15317 Observed fall: No Year found: 2021 Country: Algeria Mass: 299 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 50 approved meteorites classified as Angrite. [show all] Search for other: Achondrites, Angrites | ||||||||||||||||||||||||||||||
Comments: | Approved 22 Dec 2022 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 15317 (NWA 15317) Algeria Purchased: 2021 Oct Classification: Angrite History: Purportedly found in Algeria and purchased by Darryl Pitt in October 2021 from a dealer in Agadir, Morocco. Physical characteristics: A single ellipsoidal stone (299.3 g) about 40% covered by black fusion crust. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen with porphyritic dendritic texture. Larger grains (up to 1.5 mm) of compositionally-zoned Al-Ti-augite (pink with purple-brown rims in thin section) and Ca-bearing olivine plus smaller laths of anorthite are set within finer grained interstitial regions composed of intergrowths of the same phases plus kirschsteinite, troilite, ulvöspinel, silicoapatite and calcite. Geochemistry: Olivine (Fa47.7-77.7Ln2.1-8.6, FeO/MnO = 70-90, N = 6), Al-Ti-augite (Fs22.9-47.1Wo50.5-53.2, FeO/MnO = 83-134, Al2O3 5.4-8.7 wt.%, TiO2 1.9-4.7 wt.%, N = 8), kirschsteinite (Fa64.3-81.5Ln33.1-15.3, FeO/MnO = 62-74, N = 4), anorthite (An99.3-99.8Or0.0, N = 4). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O=2.353, 2.457, 2.283; δ18O=4.734, 4.802, 4.529; Δ17O=-0.146, -0.079, -0.108 per mil (all data linearized, TFL slope = 0.528). Classification: Angrite (medium grained, porphyritic, dendritic). Specimens: 20.2 g including one polished thin section and one polished slice at UWB; remainder with DPitt. | ||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||
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) 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) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
||||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||||
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. ?
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|