Volcanic rock commonly known as pumice or porous basalt, also known as pumice rock, it is a dense porosity of molten magma condensed by volcanic eruption glassy lava, the porosity volume accounted for more than 50% of the volume of the rock.

Light stone, also known as pumice or pumice rock, is named because of its more pores and small volume weight (0.3-0.4) and can float in water. Lite is a kind of porous, light glassy acid volcanic extrusive rock, its composition is equivalent to rhyolite. The surface of light stone is rough, the particle bulk weight is 450kg/m3, the loose bulk weight is about 250kg/m3, the porosity is 71.8-81%, and the water absorption is 50-60%.

The following material was taken from Carpenter, P.A., III, Reid, Jeffrey C., and Gardner, Charles H., 1995, North Carolina, U.S.A.: An industrial mineral storehouse, in Brian J. Walker, editor, Claudette M. Simard, compiler, Proceedings of the 28th Symposium on Industrial Minerals, May 3-8, 1992, Martinsburg, West Virginia, USA, West Virginia Geologic and Economic Circular C-46, p. 65-70. Copies of the complete paper including maps and figures, and references are available from the authors upon request. Use of this material should be accompanied by appropriate citation.

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