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The primary eruption characteristic used to determine the volcanic explosivity index is the volume of pyroclastic material ejected by the volcano. Pyroclastic material includes volcanic ash, tephra, pyroclastic flows, and other types of ejecta.
Color Index The color index of igneous rocks is a very useful indicator of the types of minerals present in the rock and therefore the specific type of rock. The color index of an igneous rock is a measure of the ratio of dark colored, or mafic, minerals to light colored, or felsic, minerals.According to Bowen's Reaction series, minerals crystallize at different temperatures depending on their chemical composition.he color index of an igneous rock is a measure of the ratio of dark colored, or mafic, minerals to light colored, or felsic, minerals. According to Bowen's Reaction series, minerals crystallize at different temperatures depending on their chemical composition.