The industrial quartz crystal industry rebounded sharply during the second half of 1983. Estimated domestic mine production of lasca, the mineral feedstock material used for growing cultured quartz crystal, increased fourfold during the year. The recovery in the cultured quartz industry was due to a turnaround in the automotive industry, which uses quartz crystal in its microprocessors, and increased quartz sales for microprocessors in computer hardware, videocassette recorders, and cordless telephones. In 1983, cultured quartz crystal was produced by seven companies in five states. About 32 companies in 11 states consumed quartz crystal to produce crystal units for various electronic and optical products.