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What processes drive the rock cycle? Where do each of the different rock types form? Clastic fragments of other rocks and minerals. The size and shape of the rock fragments helps determine their names Conglomerate, sandstone and shale Organic Forms from organic shells or skeletal remains that cement into rock. • fossiliferous limestone Chemical Forms from chemicals dissolved in water Limestone + Heat and Pressure = Foliated Metamorphic rocks that have ribbonlike layers in their textures. Gneiss (nice) Common in NJ • Non-foliated Marble • Metamorphic rocks made of only one or two minerals and have no layering. Limestone + Heat and Pressure = Marble Obsidian Forms when magma comes to surface and cools = extrusive Glassy, no crystals Volcanic glass Granite Forms when magma cools below the surface= intrusive Scoria Volcanic rock Many gas bubbles What processes drive the rock cycle? Where do each of the different rock types form?