21. Numerous local operations were involved in smaller-scale industrial mineral production, especially the semiprecious gemstone sector. 22. It is an industrial mineral and a commercial product useful for its low density after processing. 23. Pakistan has a large base for industrial minerals . 24. Founded in 1970, Unimin is one of North America s largest producers of non-metallic industrial minerals . 25. The lone improvement for the half was in industrial minerals , such as borates and titanium dioxide. 26. In the 1960s, the company acquired an industrial minerals business, producing granite and limestone in Florida. 27. Andhra Pradesh has varied geological formations with a rich variety of industrial minerals and building stones. 28. Industrial Minerals was actually conceived in 1962. 29. Its product range includes essential energy minerals like lignite, base metals and industrial minerals like bauxite and flourspar. 30. Many other substances are extracted including titanium, asbestos, silver, magnesium, nickel and many other metals and industrial minerals .
