SAFELY AMORPHOUS (NON-CRYSTALLINE) IN STRUCTURE AND COMPOSED PRIMARILY OF ALUMINUM SILICATE, PUMICE IS A NATURALLY CALCINED VOLCANIC GLASS FOAM CONSISTING OF HIGHLY VESICULAR STRANDS PERMEATED WITH TINY AIR BUBBLES. IT IS THIS FRIABLE, LIGHTWEIGHT, FOAMED-STONE CHARACTER THAT GIVES PUMICE ITS REMARKABLE AND WIDELY USEFUL QUALITIES.

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