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Northwest Africa 7898 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7898 This is an OFFICIAL meteorite name. Abbreviation: NWA 7898 Observed fall: No Year found: 2012 Country: Morocco Mass: 180 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 215 approved meteorites classified as CK5. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites | ||||||||||||||||||||||||||
Comments: | Approved 19 Jun 2013 | ||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7898 (NWA 7898) Morocco Purchased: Dec 2012 Classification: Carbonaceous chondrite (CK5) History: Purchased by Jack Schrader from a meteorite dealer in Erfoud, Morocco, December 2012. Physical characteristics: Single stone, black fusion crust, saw cut reveals chondrules of variable size set in a dark gray matrix. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows distinct, equilibrated PO, POP chondrules, many in the range 300-800 μm, but some >1 mm. Chondrules commonly mantled by plagioclase or opaques. Ubiquitous high-Ca pyroxene, pigeonite, and Cr-rich magnetite. Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine Fa31.0±0.3, Fe/Mn=113±7, NiO=0.52±0.06 wt%, n=31; low-Ca pyroxene Fs28.0±1.0Wo1.1±1.3, Fe/Mn=78±5, n=14; plagioclase Or2±1Ab61±15An36±16, n=4; magnetite Cr2O3=3.8 wt%, n=2. Classification: Carbonaceous chondrite (CK5), CK based on olivine Ni-content, Fa and Fe/Mn, presence of Cr-magnetite, and intermediate plagioclase composition. Type 5 based on olivine and pyroxene compositions with relatively low Fa,Fs-sigma. Specimens: 20 g including a probe mount on deposit at UNM, Jack Schrader 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 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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