Igneous rock Contains large crystals Hard rock Cooled slowly under the surface of the Earth (intrustive) Composed mainly of quartz Found mainly in Dartmoor, southern Devon, England.
Igneous rock Contains non-visible crystals Hard rock Cooled quickly on the surface of the earth (extrusive) Composed mainly of plagioclase and pyroxene minerals Found mainly in northern Co. Antrim, most famously at the Giant's Causeway
Sedimentary rock Composed of calcium carbonate Porous Susceptible to weathering by solution Primarily found in the South Downs
Sedimentary rock Composed of compressed layers of sand Hard rock Commonly used for paving Found at Baggy Point, Devon
Metamorphic Rock Usually forms on a continental side of a convergent plate boundary where sedimentary rocks have been subjected to pressure and heat. Formed mainly from shale Contain visible crystals Can be found in South Devon
Metamorphic rock Composed of shale Extremely fine-grained Typically used in building Commonly found in Snowdonia