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Products We produce a variety of industrial minerals, ranging from crushed and graded stone to value-added materials. Great Lakes Minerals Chemical limestone · Construction aggregates Global Stone Lime · Limestone fillers · Chemical limestone · Construction aggregates · Lawn and garden products Performance Minerals Industrial sands · Fracturing sands · Foundry sands · Filtration sands · Golf course sands · Feldspathic sands · Silica flour · Wet and dry ground mica · Surface-modified mica