. . "As a result, there is a risk of an industrial sand shortage due to the natural gas and oil boom, says Pat Watson, president of Cardinal Corp.???s float glass division in Portage, Wis. ???Sand manufacturers over the years have always sold to glass and fracking businesses, and typically, the glass sand is a lower priced product,??? he says. ???As a matter of fact, in some mines, glass sand was actua" . .