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Northwest Africa 4825 | |||||||||||||||||||
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Basic information | Name: Northwest Africa 4825 This is an OFFICIAL meteorite name. Abbreviation: NWA 4825 Observed fall: No Year found: 2006 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 17 Apr 2008 | ||||||||||||||||||
Writeup![]() |
Writeup from MB 94:
Northwest Africa 4825 Northwest Africa Find: 2006 Achondrite (eucrite, polymict) History and physical characteristics: A 226 g complete stone with moderately fresh fusion crust was purchased in Tucson at the Tucson Gem and Mineral Show in January 2007. Petrography: (J. Wittke and T. Bunch, NAU) A brecciated polymict eucrite with cataclastic flow veins and partially recrystallized matrix. Consists of cumulate, subophitic, and ophitic basalt clasts. A portion of the plagioclase was converted to maskelynite by shock and most pyroxenes are shock-decorated. Weathering grade is very low. Mineral compositions: subophitic orthopyroxene host, Fs56.8Wo3.6 (FeO/MnO = 30–32); exsolution lamellae, Fs29 Wo39.5. Pigeonite is Fs56.7Wo8.8 and plagioclase is An90.2–94.5. Minor minerals include silica, chromite, ilmenite, and FeS. Classification: Achondrite (eucrite, polymict). Type specimen: A total of 23.1 g is on deposit at NAU. The main mass holder is anonymous. | ||||||||||||||||||
Data from: MB94 Table 2 Line 67: |
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Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |