![]() |
||
|
Northwest Africa 15258 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 15258 This is an OFFICIAL meteorite name. Abbreviation: NWA 15258 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 220 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 14 Sep 2022 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 15258 (NWA 15258) (Northwest Africa) Find: 2020 Classification: HED achondrite (Eucrite, brecciated) History: Found near Algerian/Libyan border in 2020 by local meteorite hunters. Provenance: Finder-Said Yousfi-Juan A. Poblador-Robert M. Keeton. Physical characteristics: Stone has dark-brown fusion crust with reddish weathering coating on top. Petrography: (D. Sheikh, Cascadia) Sample is a breccia composed of mm-sized sub-angular to sub-rounded lithic clasts (primarily diabasic and gabbroic clasts, largest clast ~6 mm) and isolated mineral fragments scattered within a fine-grained matrix containing few melt vein and schlieren-bearing areas. No orthopyroxene clasts were observed. Accessory phases include ilmenite and SiO2-rich glass. Geochemistry: Olivine (Fa90.7±1.1, range Fa89.5-92.4, Fe/Mn=45±2, n=5), Pigeonite (Fs53.1±13.9Wo16.2±6.5, range Fs34.8-80.3Wo6.1-24.6, Fe/Mn=31±4, n=40), Augite (Fs50.9±7.1Wo26.0±1.0, range Fs45.9-62.4Wo25.1-27.2, Fe/Mn=31±4, n=5), Plagioclase (An86.1±3.5, range An81.0-92.0, n=25). Classification: HED Achondrite (Eucrite, brecciated). Some olivine and pigeonite grains are noticeably Fe-rich in composition (i.e. Fa~92.4, Fs~80.3). Specimens: 20.6 g at Cascadia, main mass with Rob Keeton. | ||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
| ||||||||||||||||||||||||||||
Photos: |
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |