Cotopaxi Volcano in Ecuador is primarily composed of andesite and dacite, which are extrusive igneous rocks.

Here's a breakdown:

* Andesite: This is the most common rock type found in Cotopaxi. It's an intermediate volcanic rock, characterized by its gray to dark gray color and its composition of plagioclase feldspar, pyroxene, and amphibole.

* Dacite: This is a more silica-rich volcanic rock, often appearing light gray to pinkish. It contains more quartz and plagioclase feldspar than andesite, along with other minerals like biotite and hornblende.

These rock types are typical of stratovolcanoes like Cotopaxi, formed by the accumulation of alternating layers of lava flows and pyroclastic material (ash, pumice, and rock fragments).