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Contact SupplierWe are offering feldspars (kalsi3o8 – naalsi3o8 – caal2si2o8) are a group of rock-forming tecto silicate minerals that make up as much as 60% of the earth's crust. Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock.