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Northwest Africa 7655 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7655 This is an OFFICIAL meteorite name. Abbreviation: NWA 7655 Observed fall: No Year found: 2012 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 183 approved meteorites classified as CR2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites | ||||||||||||||||||||||||||
Comments: | Approved 5 Feb 2013 | ||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 102:
Northwest Africa 7655 (NWA 7655) Morocco Purchased: Aug 2012 Classification: Carbonaceous chondrite (CR2) History: Purchased by Adam Bates from a meteorite dealer in Morocco, August 2012. Physical characteristics: Single stone with dark weathered irregular surface with chondrules visible through desert patina. Saw cut reveals many chondrules of variable size, some armored with metal/sulfide, scattered metal spherules, set in a dark reddish brown matrix. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules some up to 3 mm, in a fine-grained, sulfide- and metal-rich, matrix. Many chondrules contain igneous kamacite spheres, and some of the larger chondrules are rimmed with metal/sulfide. Spherical, metal-rimmed, 3 mm CAI with spinel, anorthite, and forsterite present. Geochemistry: (C. Agee and M. Spilde, UNM) Ferroan olivine Fa6.8±8.3, range Fa2.1-25.4, Fe/Mn=25±16, Cr2O3=0.60±0.11, CaO=0.19±0.05 wt%, n=13; Type I chondrule olivine Fa1.3±0.3, Cr2O3=0.38±0.11, CaO=0.37±0.14 wt%, n=15; low-Ca pyroxene Fs2.6±1.2Wo0.9±0.9, Fe/Mn=15±5, n=25; fassaite Fs2.1±1.6Wo43.1±4.8, Al2O3=7.48±1.10 wt%. Classification: Carbonaceous chondrite (CR2) Specimens: 23 g including a probe mount on deposit at UNM, Adam Bates holds the main mass. | ||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography:![]() |
Statistics: This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) |