Crushed Ice Geode coasters with raised edge

Silicone mold for a set of four Geode coasters with the Crushed Ice effect. The coasters have a raised edge and are about 11 cm (4 1/3") wide and 8 mm (1/3") thick. 

There are also molds available for a large and extra large Geode tray that have the same Crushed Ice effect and raised edge, see one of the pictures for an example (for illustrative purposes, this item is only for the coaster mold).