USGS: about Science Topics: Tholeiite

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Earth material > Volcanic rock > Mafic volcanic rock > Basalt

Tholeiite

A silica-oversaturated basalt, characterized by the presence of low-calcium pyroxenes in addition to clinopyroxene and calcic plagioclase. Olivine may be present in the mode, but neither olivine nor nepheline appear in the norm.

This category is also used for basalt (tholeiite).

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