The "obicular" type of this rock has concentrically layered, spheroidal structures and is mostly found in Finland.
The "obicular" type of this rock has concentrically layered, spheroidal structures and is mostly found in Finland. The I-type and S-type of these rocks are much more common than their M-type, which form through fractional crystallization, and Chappell and White developed a notable classification system for them. This rock is found in the upper left of the plutonic QAPF diagram, and like pegmatite, this rock can metamorphose into (*) greisen. This coarse-grained rock is mainly composed of feldspars and quartz, and the extrusive variant of this rock is rhyolite. It is less dense than basalt, which explains why oceanic plates sink beneath continental plates at subduction zones.  For ten points, name this intrusive igneous rock that is often used in countertops.
The "obicular" type of this rock has concentrically layered, spheroidal structures and is mostly found in Finland.
{granite}