Geology
The mountain is composed primarily of granite and gneiss. However, located along the ridge and plateau about 2 km (1.2 mi) west of the summit is a small andesite-dacite stratovolcano, confusingly also named Tateyama after its far more famous neighbor. This volcano has an elevation of 2,621 m (8,599 ft), and has had minor historical eruptions, the latest in 1839.
Read more about this topic: Mount Tate