Explanation
It is the general name of rock eject from the surface or condensed near the surface. It includes extrusive rock, pyroclastic rock and sub volcanic rock (ultra hypabyssal rock related to volcanic activity). According to the eruption environment, it can be divided into marine volcanic rock and continental volcanic rock. The composition varies greatly, from basic to acidic, such as basalt, andesite, rhyolite, etc., which are widely distributed, and its related minerals are quite abundant, such as zeolite, crystal, pumice, copper ore, iron ore, etc.
Classification
Natural materials and products -> Mineral materials