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Northwest Africa 7042 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7042 This is an OFFICIAL meteorite name. Abbreviation: NWA 7042 Observed fall: No Year found: 2011 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 307 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 16 Dec 2011 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 100:
Northwest Africa 7042 (NWA 7042) Morocco Found: Oct 2011 Classification: Martian meteorite (Shergottite) History: A large stone was found in October 2011 in southern Morocco and purchased from nomads by two Moroccan dealers. Physical characteristics: A single 3033 g stone partly coated by thin, brownish remnant fusion crust. Weathered surfaces are mostly brown, with distinctive bright green grains. The fine grained interior has an overall greenish-gray color, with sparkling maskelynite visible in the matrix. Petrography: (A. Irving and S. Kuehner, UWS): Aphyric assemblage of complexly-zoned pyroxene and zoned olivine with interstitial maskelynite (~15 vol.%, intergrown with ferroan pigeonite) and accessory Ti-poor chromite, ilmenite (some intergrown with ulvöspinel), pyrrhotite and merrillite. Sparse tiny grains of barite (from terrestrial weathering) present. Geochemistry: Olivine (cores Fa28.5-30.1, Fe/Mn=46-52; rims Fa46.0-48.1, Fe/Mn=48-52), pigeonite (core Fs29.0Wo13.4, Fe/Mn=29; rims and matrix grains Fs41.5-44.5Wo17.5-9.0, Fe/Mn=35-36), subcalcic augite (Fs22.4Wo31.4, Fe/Mn=26), plagioclase (An48.6-54.5Or1.7-1.8). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 3.102, 3.016; δ18O = 5.326, 5.079; Δ17O = 0.298, 0.341 per mil. Classification: Achondrite (Martian, shergottite). Specimens: A total of 20.2 g of type material and one polished thin section are on deposit at UWS. | ||||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1590: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
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) OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:![]() |
Statistics: This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater) |