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Invertebrate Inn Fireplace

The igneous rocks of the Invertebrate Inn's fireplace were formed by the cooling of hot molten material, called magma when it intrudes below the surface of the Earth and lava when it extrudes out across the Earth's surface. The fireplace rocks are all intrusive, and are coarse grained because crystals had more time to grow in magma that cooled slowly deep below the Earth's surface.