Quartz dust consists of small rock particles that are difficult to see. Quartz dust is often found in construction, steelworks, foundries, grinding, drilling, chiseling in concrete, etc. (According to AFS 2015:2)
The risk is that you contract grinder's disease. This can be a consequence of inhaling the finest respirable quartz dust particles, which can also lead to an increased risk of lung cancer. Symptoms may take 10 to 30 years to develop after exposure.