Tiny Holes Basalt The tiny holes basalt is a kind of special basalt with tiny gas holes.The gas holes in this basalt is about one mm that distributed regularly. The quarry of it is in our location. Their density is 3 tons per cube meter. Due to the tiny holes it can not be polished and not be fla

Middle Holes Basalt (lava) The Middle holes basalt is a special kind of lava with middle gas holes and small gas holes. The middle holes are about 8-15mm and small holes are about 3-10mm that distributed irregular and disproportionate on surface. The quarry of it is in our location only. Their de