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basanite

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
basanite [ˈbæsəˌnaɪt]
n
(Earth Sciences / Geological Science) a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone
[see basalt]


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Three reference suites from Iceland, Moorea and Tristan da Cunha illustrate (respectively) the tholeiitic series containing basalt to rhyolite, the alkaline series with alkali basalts to trachytes and a strongly alkaline series, beginning with basanite and ultimately yielding phonolite; few oceanic islands contain tholeiiteseries rocks.
Carrier rocks are postulated to be nephelinite, basanite and leucitite.
 
 
 
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