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Northwest Africa 2627 | |||||||||||||||||
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Basic information | Name: Northwest Africa 2627 This is an OFFICIAL meteorite name. Abbreviation: NWA 2627 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||
Classification history: |
This is 1 of 91 approved meteorites classified as Acapulcoite. [show all] Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites | ||||||||||||||||
Writeup![]() |
Writeup from MB 89:
Northwest Africa 2627 Northwest Africa Found 2004 Achondrite (acapulcoite) A 68 g mostly crusted, partial stone was purchased in Erfoud in October 2004. Description and classification (T. Bunch and J. Wittke, NAU): recrystallized into polygonal and subhedral grains with the exception of large orthopyroxene grains (up to 3 mm) that poikilitically enclose olivine; heavily fractured, variable grain size, and heterogeneous distribution of phases. Modal analyses (vol. %): orthopyroxene, 44; olivine, 41; FeS, 6; metal (and Fe-oxides), 5; plagioclase, 3 and minor merrillite, Ca-pyroxene and chromite. All silicates have very homogeneous compositions; olivine, Fa13.1 (FeO/MnO = 26); orthopyroxene, Fs12.2 Wo2.7 (FeO/MnO = 13.9); plagioclase, An21.9; metal, Ni = 6.7 wt. % Ni. Oxygen isotopes (D. Rumble, CIW): replicate analyses of acid-washed whole rock material by laser fluorination gave d17O = 1.82, 1.75, 1.47, 1.56‰; d18O = 4.93, 4.96, 4.51, 4.51‰; D17O = -0.781, -0.865, -0.908, -0.821‰. Weathering grade is W2/3 with ferric Fe staining; shock level is low to moderate. Specimens: type specimen, 13.7 g, NAU: main mass, Strope/MFarmer. | ||||||||||||||||
Data from: MB89 Table 7 Line 345: |
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Plots: | O isotopes: | ||||||||||||||||
Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) 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. 89, MAPS 40, A201-A263 (2005)
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Geography: |
Statistics: This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |