![]() |
||
|
Northwest Africa 7197 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 7197 This is an OFFICIAL meteorite name. Abbreviation: NWA 7197 Observed fall: No Year found: 2009 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 69 approved meteorites classified as L3.8. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||
Comments: | Approved 8 Mar 2012 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 100:
Northwest Africa 7197 (NWA 7197) Morocco Purchased: 2009 Classification: Ordinary chondrite (L3.8) History: Purchased by B. Reed in Tucson, 2009. Physical characteristics: Cut surface shows gray matrix with some patches of red-brown oxidation, chondrules to 3mm, some rimmed by metal or sulfide. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows olivine, orthopyroxene, clinopyroxene, feldspathic mesostasis, BO, PO, POP chondrules, ubiquitous troilite, Fe-Ni metal, and weathered iron oxide. Geochemistry: (C. Agee and N. Wilson, UNM) Olivine Fa25.6±4.3, Fe/Mn=59±16, n=37, low-Ca pyroxene Fs14.5±7.2Wo1.1±0.9, Fe/Mn=32±15, n=33, high-Ca pyroxene Fs20.1±3.1Wo27.2±7.9, Fe/Mn=32±3, n=5. Classification: Ordinary chondrite (L3.8), subtype statistically based on olivine sigma of Fa=4.3 or PMD=15 (n=37) and low-Ca pyroxene sigma of Fs=7.2 or PMD=47 (n=33). Weathering grade W3. Specimens: 25.1 g including a probe mount on deposit at UNM, Reed holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1667: |
|
||||||||||||||||||||||||||||
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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
| ||||||||||||||||||||||||||||
Geography:![]() |
Statistics: This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) |