Definition of dacite in English:



  • A volcanic rock resembling andesite but containing free quartz.

    • ‘The canyon is carved out of dacite, and there are some large trees with yellow and green leaves.’
    • ‘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 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.’


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