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Basalt stone (Lava stonee/Volcanic Rock) is an actual stone that is produced from volcanic eruptions. It is a rough stone fairly light in weight and gray in color. The strange of Basalt (lava stonee/Volcanic Rock) is its vesicular and natural, seeing from its cutting surface , the holes are much bigger in the upper and smaller downwards and more highly concentrated.For more details, please contact us at mail:dacheng_stone(at)163.com