The word "metamorphic" refers to a process of change or transformation. It is often used to describe rocks that have undergone immense heat and pressure, causing them to change their form and composition.
A variety of gifts were interred with the dead: pottery, bone and stone beads and pendants, stone axes made of metamorphic rocks, flint and obsidian blades, shell pendants, and shell and bead necklaces. (scientificamerican.com)
However, P5 is likely made of metamorphic rocks, making it incapable of holding ice in the same way that comets do. (sciencedaily.com)
Pore spaces that shelter subsurface microbes areconstricted to the vanishing point in metamorphic rocks buried over eons byfurther sedimentation, volcanic eruptions, or massive folding of Earth's crust.And dense crystalline material formed by melting — basic igneous rock — offerslittle housing or dining. (discovermagazine.com)