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Northwest Africa 15655 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15655 This is an OFFICIAL meteorite name. Abbreviation: NWA 15655 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 329 approved meteorites classified as Lunar (feldsp. breccia). [show all] Search for other: Lunar meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Feb 2023 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 112:
Northwest Africa 15655 (NWA 15655) (Northwest Africa) Purchased: 2022 Classification: Lunar meteorite (feldspathic breccia) History: Three stones weighing 94.0, 103.1, and 249.4 g were purchased in March 2022 by Shun-Chung Yang and Juan Chen from a meteorite dealer in Algeria. Physical characteristics: Three stones with dark-brown fusion crust. Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised of mm to cm-sized sub-angular lithic and mineral clasts set within a fine-grained fragmental matrix containing accessory ilmenite and merrillite. Clast lithologies identified include anorthosites, olivine norites, noritic anorthosites, and anorthositic norites. Geochemistry: Olivine (Fa43.9±8.1, range Fa27.6-59.2, Fe/Mn=89±2, n=9), Low-Ca Pyroxene (Fs45.0±1.4Wo3.9±1.4, range Fs44.0-46.0Wo2.9-4.9, Fe/Mn=56±3, n=2), Pigeonite (Fs35.8±6.2Wo13.6±3.9, range Fs26.3-48.8Wo8.2-23.1, Fe/Mn=57±6, n=11), High-Ca Pyroxene (Fs20.3±1.5Wo38.9±2.3, range Fs19.3-21.3Wo37.2-40.5, Fe/Mn=49±4, n=2), Calcic Plagioclase (An96.3±1.3, range An92.4-98.7, n=20). Classification: Lunar (feldspathic fragmental breccia) comprising a mix of FAN, MAN, and Mg-suite lithologies. An unusual 20 μm grain of near end-member enstatite (Fs0.4Wo1.2, Al2O3 wt. % ~0.6) was identified within the matrix. Specimens: 20.09 g at Cascadia, main mass with Shun-Chung Yang and Juan Chen. | ||||||||||||||||||||||||||||||
Data from: MB112 Table 0 Line 0: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |