Sand is a granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type;, a soil containing more than 85 percent sandsized particles by mass.
The Minnesota Pollution Control Agency reports air quality data from Minnesota silica sand facilities. DNR and Silica Sand. The Minnesota Department of Natural Resources provides addition information about silica sand projects and silica sand mining.