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Northwest Africa 1877 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 1877 This is an OFFICIAL meteorite name. Abbreviation: NWA 1877 Observed fall: No Year found: 2003 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 9 approved meteorites classified as Diogenite-an. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 88:
Northwest Africa 1877 Morocco Purchased 2003 June Achondrite (Olivine-rich diogenite) A partly crusted stony meteorite (312 g) was purchased in Zagora by a Moroccan dealer for A. and G. Hupé (xHupé) in 2003 June and more of the same material (622 g) was purchased in Tagounite in 2003 December. Classification and mineralogy (A. Irving and S. Kuehner, UWS): Coarse grained, dense and somewhat friable, with an overall yellow-green color. Harzburgitic peridotite composed of subequal amounts of orthopyroxene (Fs22.4-23.3Wo1.5; FeO/MnO = 25.2-29.7) and olivine (Fa27.8, FeO/MnO = 44-50) with minor Al-poor chromite [Cr/(Cr+Al) = 84.8-88.0, Mg/(Mg+Fe) = 11.7-19.8], troilite (as abundant blebs within silicates and as inclusions in chromite), and sparse Ni-free metal (partly altered to limonite). The modal amount of olivine estimated from three serial thin sections is approximately 45%, which is consistent with the moderately high density of this meteorite. The relatively magnesian silicate compositions are similar to those in Antarctic olivine diogenite GRA 98108, and quite different from those in another Moroccan olivine diogenite NWA 1459 (Irving et al., 2003). Unlike both of these examples, however, NWA 1877 does not contain plagioclase. Specimens: type specimen, 24 g and three polished thin sections, UWS; main mass, xHupé. | ||||||||||||||||||||||||||||||||||||||||||||||||
Data from: MB88 Table 4 Line 44: |
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Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) xHupé: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
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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) |