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What is a dacite?

What is a dacite? Here are some definitions.

Noun
  1. (geology) An igneous, volcanic rock with a high iron content.
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South of Tricouni Peak are andesite and dacite lava flows that form two non-overlapping sequences.
These are called tension gashes and formed as the dacite split open allowing the quartz fluid to fill in the cracks.
These are overlain by flows of rhyolite, dacite, and andesite totalling about 900 m in thickness.
They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite.
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.
Four common volcanic rock types are basalt, andesite, dacite, and rhyolite.

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