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economic geology of mica minerals in usa

BOCK FORMATIONS METAMORPHIC ROCKS Most of the district is underlain by mica schist and gneiss Mica either muscovite or biotite is the chief constituent but quartz and feldspar are present in mod­ erate to large quantities Sillimanite is widely distrib­ uted as a minor constituent and locally is very abundant... 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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