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, ...

Cristobalite and tridymite are two other forms of crystalline silica. Crystalline silica is found in many common construction materials including sand, stone, concrete, masonry, mortar and landscaping ...

See how the rubber band becomes taut and more resistant to downward pressure? The same principle holds true for prestressing strands. 4. Cement, sand, stone, and water make up concrete.