... 2000,ISO14001:2004 Sand rock is a type of high quality natural rock without light pollution or ... goethite around 18%;D.miscellaneous over 10%Sand rock,sound insulation,moisture absorption,no weathering outside, ... research and development and producing all kinds of stone in China.There are 151technicians in our ... all kinds of slabs,sculptures and irregular stone,such as granite,marble,sandstone,slate and ...