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| Northwest Africa 4833 | |||||||||||||||||||
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| Basic information | Name: Northwest Africa 4833 This is an OFFICIAL meteorite name. Abbreviation: NWA 4833 Observed fall: No Year found: 2007 Country: Morocco Mass:  608 g | ||||||||||||||||||
| Classification history: |
This is 1 of 93 approved meteorites classified as Lodranite. [show all] Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites | ||||||||||||||||||
| Comments: | Approved 17 Apr 2008 | ||||||||||||||||||
| Writeup |
Writeup from MB 94:
Northwest Africa 4833 Northwest Africa Find: 2007 Achondrite (lodranite) History and physical characteristics: A 608 g dark stone with a dull desert varnish and no remaining fusion crust was found in northwest Africa in 2007 and purchased by A. Aaronson in July 2007. Petrography: (T. Bunch and J. Wittke, NAU) The stone displays a coarse-grained (olivine grains up to 6 mm) hypidiomorphic texture. Orthopyroxene shows a common lobate grain boundary relationship with olivine. Orthopyroxene is highly decorated with exsolved linear to bleb-shaped diopside (0.002 to 0.04 mm in size) that is oriented parallel to at least three crystal planes of the orthopyroxene host. Olivine is decorated with 0.005– 0.02 mm sized ovoid-shaped microlites of plumose chromite set in anhedral diopside. Mineral modes (vol%) are: olivine = 65, orthopyroxene = 30, metal and oxidized metal = 2, chromite and diopside = 3, no plagioclase was found. The shock level is S3 based on moderate mosaic extinction in olivine and orthopyroxene and minor shock twinning in both. Mineral compositions: Olivine (Fa10.1; FeO/MnO = 23), orthopyroxene (Fs9.4Wo2.3; FeO/MnO = 14), diopside (Fs8.0Wo45.9; FeO/MnO = 11), metal (2.98 wt% Ni) and FeS Cr = 1.1 wt%. Chromite cr# = 85. Classification: Achondrite (lodranite). Type specimen: A 22.2 g sample is on deposit at NAU. A. Aaronson holds the main mass. | ||||||||||||||||||
| Data from: MB94 Table 2 Line 73: |
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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) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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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:
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Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||
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| Revision history: |
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