High heat and pressure cause the calcite
in the limestone to recrystallize into larger
Shale, which consists of clay minerals, is put under
pressure with temperatures of a few hundred degrees
or so. Then the clays begin to revert to the mica
minerals from which they formed to change to slate.
Gneiss is a high grade
metamorphic rock, the product
of various rock types being
exposed to intense pressures
and heat under the surface of
The gneiss has been
around longer, meaning that
it has more opportunity to be
Possible pathways for different parent
sedimentary and igneous rocks
What is the parent rock of marble?
Shale is the parent rock of what?
Granite is the parent rock of what?
What is a rock and why?