Question: what are the physical properties of limestone?
Answer: Limestone is a sedimentary rock such as greater than 50% calcium carbonate ( calcite – CaCO3). ... 
Colour: It can be yellow, white, or gray.
Chemical Composition: Calcite.
Texture – Clastic or Non-Clastic.
Grain size – Variable, can consist of clasts of all sizes.
Hardness – Generally hard.