- Basalt stones is caused by the cooling of lava that is less viscous. A silica content in the range of 45-52 percent
- Stone Andes are the rock caused by the cooling of lava that has a moderate viscosity. A silica content in the range of 52-66 percent
- rhyolite rocks are rocks formed by cooling lava is viscous. A silica content of more than 66 per cent