rock Hard mineral material igneous rock Rock solidified from volcanic lava or magma metamorphic rock Rock that has undergone transformation by heat, pressure or other natural agencies sedimentary rock Rock formed from sediment deposited by water or wind basalt Dark fine grained volcanic rock composed largely of plagioclase with pyroxene and olivine granite Hard crystalline igneous rock consisting mainly of quartz, mica and felspar marble Hard crystalline metamorphic form of limestone slate Fine grained metamorphic rock easily split into smooth, flat plates limestone Hard sedimentary rock composed mainly of calcium carbonate sandstone Sedimentary rock consisting of sand or quartz grains cemented together lapis basanites moorstone slatestone arenaceous rock