... permeation, not poisonous a Lava stone1. Used widely in outer wall decoration2. Not radiation, not permeation, not poisonous and not ... , this volcanic stone material can be used widely in outer wall decoration, such as road, square paving, living district gardening, ... , etc., with all kinds of shapes . Shijiazhuang Mining Imp&Exp Trade Co., Ltd is a company that gathered in the manufacture, trade and ...