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Northwest Africa 2988 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 2988 This is an OFFICIAL meteorite name. Abbreviation: NWA 2988 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 588 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||
Comments: | Approved 28 Mar 2007 | ||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 91:
Northwest Africa 2988 Algeria Find: 2006 Achondrite (eucrite) History: The main mass holders purchased the stone in Erfoud, Morocco, in September 2006. Physical characteristics: A single, complete stone of 4602 g with partial, moderately weathered fusion crust. Petrography: (T. Bunch and J. Wittke, NAU) Microgranular (pyroxenes < 0.05 mm; plagioclase < 0.1 mm) with rare pyroxene splays and rare megacrysts of plagioclase and pyroxene (up to 0.6 mm in longest dimension). At least two brecciation episodes (breccia-in-breccia) are cross-cut by shock melt injection veins. These melt veins have bulk major and minor elemental compositions consistent with typical eucrite bulk compositions. The stone contains orthopyroxene, augite, plagioclase, chromite, and troilite. Mineral compositions and geochemistry: Orthopyroxene (Fs61Wo2.1), augite (Fs42.3Wo37.8), chromite (cr# = 81), plagioclase (An92.3). EMP broad beam analysis of the shock melt glass is: Si = 22.75, Al = 8.7, Ca = 9.45, Ti = 0.45, Cr = 0.2 1, Fe = 12.4, Mg = 3. 1, Mn = 0.3 (all wt%). Classification: Achondrite (eucrite); S5, minimal weathering. Type specimens: A total of 20.1 g and one thin section are on deposit at NAU. MFarmer and Strope hold the main mass. | ||||||||||||||||||||||||
Data from: MB91 Table 2 Line 144: |
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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) MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address) Strope: 421 Fourth Street, Glen Dale, WV 26038, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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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) |