The three most common natural building stones are limestone, sandstone, and granite.

• Limestone is a sedimentary rock composed largely of the mineral calcite (calcium carbonate: CaCO3).
• Sandstone is a sedimentary rock composed of sand grains glued together by silica or calcium carbonate.
• Granite is a plutonic igneous rock having visibly crystalline texture; generally composed of feldspar, mica and quartz

All three of the above mentioned stones are available throughout Ontario, with a wide variety of colours and textures.