Limestones with small particles are called ooliths. The large grain sized limestone can be up to pea sized. The color can be white to yellow,light brown, pink,red, or dark brown to black. Limestone is often cut into large blocks and used for flooring companies and to build large buildings. Crushed limestone is used to make cement, plaster, and chalk.
Limestone fizzes in vinegar, which means that it reacts to acid.
That means that if a building is built with limestone, it could collapse under acid rain.