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I do not know specifically but it is fairly high in silica making it rather viscous and good for trapping/holding gas. Dactic magmas can be either exlposive volcanic events or just be mild lava flow depending on the amount of trapped gas.

Dactic sits between Rhyolitic and Andisitic in compostion. Rhyolitic is highest in viscosity have the most Silica then Dactic, andesitic then basaltic having the least silica.

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