Crystalline silica is a common mineral found in the earth's crust. Materials like sand, stone, concrete, and mortar contain crystalline silica. It is also used to make products such as glass, pottery, ...

Fire crews are currently fighting the Sand Stone Fire, burning 14 miles northeast of Fountain Hills since July 25. The fire has burned 27,390 acres and is 96% contained as of Aug. 10. A closure ...