FRACKING SAND
"Frac sand" is a high-purity quartz sand with very durable and very round grains. It is a crush-resistant material produced for use by the petroleum industry. It is used in the hydraulic fracturing process (known as "fracking") to produce petroleum fluids, such as oil, natural gas and natural gas liquids from rock units that lack adequate pore space for these fluids to flow to a well. Most frac sand is a natural material made from high purity sandstone.

Applications
Petroleum industry proppants must meet very demanding specifications. The characteristics of a high quality frac sand include:
high-purity silica sand
grain size perfectly matched to job requirements
spherical shape that enables it to be carried in hydraulic fracturing fluid with minimal turbulence
durability to resist crushing forces of closing fractures
Frac sand is produced in a range of sizes from as small as 0.1 millimeter in diameter to over 2 millimeters in diameter depending upon customer specifications. Most of the frac sand consumed is between 0.4 and 0.8 millimeters in size.