What is denser sedimentary rock or metamorphic rock?

Answer 1

In general, metamorphic rock will have a higher density, because it's put under pressure, and will decrease in size because of that.

Answer 2

Metamorphic rock is generally denser than sedimentary rock. This is because metamorphic rocks undergo intense pressure and/or heat, which causes the minerals within them to recrystallize and become more tightly packed, resulting in a denser structure. Sedimentary rocks, on the other hand, are formed from the accumulation and compression of loose sediment particles, which may not be as dense as the tightly packed minerals in metamorphic rocks.