Andesite

Andesite (/ˈæn.dɪˌsaɪt, -də-, -ˌzaɪt/) is an extrusive volcanic rock of intermediate composition. In a general sense, it is the intermediate type between basalt and rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. The name andesite is derived from the Andes mountain range, where this rock type is found in abundance.

Andesite

Andesite (/ˈæn.dɪˌsaɪt, -də-, -ˌzaɪt/) is an extrusive volcanic rock of intermediate composition. In a general sense, it is the intermediate type between basalt and rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. The name andesite is derived from the Andes mountain range, where this rock type is found in abundance.