Limestones and dolostones are chemical sedimentary rocks. They are formed on the sea floor.  Some of the sediments on today’s sea floor probably represent an early stage in the formation of fine grained limestones and dolostones.

Dolostone and limestone look alike because they are similar in composition with dolostones being slightly harder and have a brighter sheen.  The will also have a bell like ring when struck The general appearance is white or gray. Both may contain shell fragments , corals and other mineral or chemical impurities that impart varying color to the stone.

When limestone becomes recrystalized by natural forces, it becomes marble.  All of the features of its original form are lost and it becomes an even grained rock with a sugary texture. Pure marble is snow white but the inclusion of various minerals and organic substances impart the color and foliation that give it its unique beauty.