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Unexpanded Perlite Ore is a non-renewable resource which is used for agriculture, horticulture, and various other industrial processes. It is said to be an amorphous volcanic glass having low density and ability to soften at temperatures of 850 to 900 degrees Celsius. This ore is also used in construction materials including mortar, concrete, plasters, & ceiling tiles. When grinded & sifted, Unexpanded Perlite Ore can serve as an excellent filtering aid as alternative to diatomaceous earth.