Definition of dacite in English:

dacite

noun

Geology
  • [mass noun] 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.’
    • ‘The belt comprises subalkaline andesites, trachyandesites, dacites, rhyolites, trachyrhyolites, and granodiorites, granites, granosyenites and monzonites, and developed along an active continental margin.’
    • ‘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.’
    • ‘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.’

Origin

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

Pronunciation:

dacite

/ˈdeɪsʌɪt/