What is the meaning of the word "dacite"?

Definitions:

  1. A volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali. copy to clipboard NOUN
    • The rugged landscape of the Andes Mountains is dotted with dacite domes. copy to clipboard
  2. A volcanic rock resembling andesite but containing free quartz. copy to clipboard NOUN
    • The explosive eruption of Mount St. Helens in 1980 produced large quantities of dacite. copy to clipboard
  3. A volcanic rock that is light in color and contains 62-69 percent silica. copy to clipboard NOUN
    • Mining companies pay close attention to dacite formations, as the hydrothermal alteration of this rock can lead to significant mineral deposits, including gold and silver. copy to clipboard

Synonyms: