Isograds separate zones of these rocks, which are based on the presence of an index mineral. One process that creates these rocks is restricted to an aureole and is the contact type. One property of these rocks can be a result of alternating felsic and mafic layers, forming light and dark bands. That property can also be due to the sheets in sheet silicates orienting themselves perpendicular to the direction of maximum (*
Isograds separate zones of these rocks, which are based on the presence of an index mineral. One process that creates these rocks is restricted to an aureole and is the contact type. One property of these rocks can be a result of alternating felsic and mafic layers, forming light and dark bands. That property can also be due to the sheets in sheet silicates orienting themselves perpendicular to the direction of maximum (*) stress. That property of these rocks results in cleavage along parallel planes and is known as foliation. They include hornfels and gneiss. For 10 points, name these rocks formed under high pressure and temperature from igneous or sedimentary rocks.
Isograds separate zones of these rocks, which are based on the presence of an index mineral.
{metamorphic} rocks