Silica is a common mineral found in the earth's crust. When workers cut, grind, drill, or crush materials containing silica, such as concrete and stone, they may inhale tiny crystalline silica particles. These particles can cause severe lung disease, including lung cancer and silicosis. To prevent workers from getting sick, the Occupational Safety and Health Administration (OSHA) has set guidelines for limiting exposure to respirable crystalline silica. In Texas, AB Labs offers respirable crystalline silica testing services to help employers comply with OSHA's regulations.