Anthropologie Set Of 4 Molten Rock Geode Coasters Crackle Glass Tiles 4x4" Set of four Anthropologie ceramic coasters. Beige background with textured green glaze centers. Sturdy glazed finish. Stylish neutral tones for tabletops. Set of Anthropologie Molten Rock Ceramic Square Coasters. These distinctive bohemian style home accessories feature a square stoneware base with a raw edge, a central pooling layer of vibrant colored ceramic glaze, and crackled molten upcycled glass to create a textured, geode-like finish. Because they are handmade, every piece features unique structural variance and crystallization layout. These specific items are archival, four crackle glaze stone coasters.