Definitions for "Dacite"
A fine-grained, igneous rock composed essentially of plagioclase feldspar and quartz, with or without hornblende and biotite. Included in the group of rocks collectively named felsite.
A volcanic rock containing 63-68% silica with a high viscosity when in a molten state.
one of the most common rock types associated with enormous Plinian-style eruptions; dacite lava consists of 63 to 68 percent silica, erupts at temperatures of between 800 and 1000°C, and is often light gray in color after cooling