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Northwest Africa 8604 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8604 This is an OFFICIAL meteorite name. Abbreviation: NWA 8604 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 391 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 30 Oct 2014 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 103:
Northwest Africa 8604 (NWA 8604) (Northwest Africa) Purchased: 2013 Classification: HED achondrite (Eucrite, polymict) History: Six stones weighing a total of 603.7 g were purchased by Blaine Reed during the 2013 Tucson Gem and Mineral Show. Physical characteristics: Samples are angular to irregular-shaped fragments devoid of fusion crust. One stone shows a rounded exterior side with desert patina. Some stones contain a caliche patina. Petrography: Description and classification (A. Love, App): Sample is a light gray, grain-supported fragmental breccia composed of clasts of cumulate and basaltic eucrites, related clastic materials and ~1 vol% diognitic orthopyroxene. 400 μm - 3.0 mm clasts are rounded to angular in shape and include: fine to medium-grained, ophitic, weakly shocked and shock melted cumulate eucrites. Cumulate clasts and related debris are composed of orthopyroxene, exsolved pigeonite and plagioclase displaying albite and Carlsbad twinning. Accessory minerals include olivine, a silica polymorph, ilmenite, troilite, minor chromite, and apatite. Geochemistry: (A.Love, App) Orthopyroxene (Fs43.8-57.2Wo1.2-3.3), pigeonite host (Fs38.5-56.7Wo6.7-17.7), with clinopyroxene exsolution lamellae (Fs26.4-32.7Wo38.9-22.8); Ca-rich clinopyroxene (Fs26.2Wo38.6), Plagioclase (An88.9), diogenitic orthopyroxene (Fs33.4Wo3.2). Classification: HED Achondrite (polymict eucrite) Specimens: 28.3 g and 2 polished thin sections are on deposit at App | ||||||||||||||||||||||||||||
Data from: MB103 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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: |
Statistics: This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |