... Lava Stone,Lava Basalt,Large Hole Basalt 1) Grey color with special large holes 2) Customized sizes accepted. Large Hole Basalt ,Lava ... as per your customized requirements.1, medium hole lava basalt2, large hole lava basaltVolcanic stone is formed when the lava stream ... , this volcanic stone material can be used widely in outer wall decoration, road and square paving, living district gardening, etc. ...