Do Limestone and Marble contain Silica?
Yes, both Limestone and Marble contain silica. The level of crystalline silica in limestone is usually, but not always, below 2%, whilst that in marble is typically below 5% although it can be as high as 30%. When any stone containing crystalline silica is cut, polished or worked in any way the dust produced contains respirable crystalline silica (RCS). As RCS is hazardous when breathed in, you need to control exposure to the dust generated by working limestone or marble.
UK HSE - contains public sector information licensed under the Open Government Licence v3.0.