metamorphic rock

/ˌˈmɛdəˌmɔrfɪk rɑk/

Other forms: metamorphic rocks

Definitions of metamorphic rock

1. noun

   rock altered by pressure and heat
   types:

   amphibolite

   a metamorphic rock composed chiefly of amphibole and plagioclase

   marlite, marlstone

   metamorphic rock with approximately the same composition as marl

   hornfels, hornstone

   a fine-grained metamorphic rock formed by the action of heat on clay rocks

   gneiss

   a laminated metamorphic rock similar to granite

   schist

   any metamorphic rock that can be split into thin layers

   type of:

   rock, stone

   material consisting of the aggregate of minerals like those making up the Earth's crust