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silica and gypsum are what kind of minerals widely used in history

Opal silica mineral extensively used as a gemstone a submicrocrystalline variety of cristobalite In ancient times opal was included among the noble gems and was ranked second only to emerald by the Romans In the Middle Ages it was supposed to be lucky but in modern times it has been regarded... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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