| http://www.w3.org/ns/prov#value | - ilica suitable and used for glass manufacture, production of metallic silicon, flux, and rock wool;(4) Alumino-silicates or clays having exceptional qualities suitable and used for production of aluminum, ceramics, drilling mud, taconite binder, foundry castings, and other purposes for which common clays cannot be used;(5) Gypsum suitable and used for wallboard, plaster, or cement.(6) Block pumice
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