Creating a natural-looking fire with a gas burner and durable materials that won"t burn up requires several components, Vermiculite is used in a gas fireplace as part of the bed of embers to create a realistic looking fire that appears to have been burning a long time, This ten pound tub of vermiculite by Rutland can be used in any propane or natural gas burner pan, Other fireplace media enhancements are also available, including rock wool and artificial embers, Replacement vermiculite, For use in the burner pans of propane gas logs, SKU: RTLD311