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If you're adding rocks to your tabletop fountain, appearance and size are certainly factors, but that's not all you need to be concerned about. Rocks make great decorative filler pieces to any tabletop fountain, but you do have to select certain varieties of rock. In choosing, you'll want to select the rocks that will hold up under daily water movement over the rock's surface area. For instance, flagstone, quartz, polished rocks and many types of beach and river rocks will work nicely in a fountain environment. However, sandstone, lava rocks, mica, and moss rock will tend to deteriorate over time and are not suited for a tabletop fountain.