Dacite

/ˈdeɪsaɪt/ noun

Definition

A type of volcanic rock that is intermediate in composition between basalt and rhyolite, commonly light-colored with visible crystals.

Etymology

Named after Dacia, the ancient Roman province, because this rock type was first identified and studied in the Carpathian Mountains in that region. The suffix '-ite' is standard in mineralogy for rock types.

Kelly Says

Dacite is a rock named after a place—geologists named it after Dacia because Dacian rocks showed this intermediate composition so clearly. It's a reminder that scientific terms often hide their origins; if you know Dacia, you understand why this particular volcanic rock got its name.

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