But all these minerals are obtained in the rock crystal form and used after grinding in the industries. To help the companies in grinding tasks of minerals, we, S. D. Engineering Works, are striving day and night. We deal with the plants for grinding Quartz, Lime Stone, Dolomite and rocks of many such minerals.
Specialty Minerals Inc. (SMI) manufactures crushed and ground limestone products at two of the Performance Minerals plants. At Adams, MA and Lucerne Valley, CA, high brightness limestone from adjacent SMI mines are ground into products which range in size from ½" ( cm) white decorative landscaping stones to fine, 2 micron, powders.