Definition of dacite in English:


Pronunciation /ˈdāsīt/ /ˈdeɪsaɪt/


  • A volcanic rock resembling andesite but containing free quartz.

    ‘The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.’
    • ‘The belt comprises subalkaline andesites, trachyandesites, dacites, rhyolites, trachyrhyolites, and granodiorites, granites, granosyenites and monzonites, and developed along an active continental margin.’
    • ‘Unchallengeable examples of what are assumed to have been beta quartz appear to be limited to occurrences in silicic volcanic rocks, such as rhyolite, liparite, and dacite.’
    • ‘The lava dome is made of dacite, a fine-grained volcanic rock that contains a sprinkling of larger, visible crystals, like chopped fruit in a cake.’
    • ‘The canyon is carved out of dacite, and there are some large trees with yellow and green leaves.’


Late 18th century from the name of the Roman province of Dacia(as it was first found in the Carpathian Mountains) + -ite.