Mainly consists of calcite. It does not show much graining or crystalline structure. It has a smooth granular surface. Varies in hardness. Some dense limestones can be polished.
Common colors are black, grey, white, yellow or brown.
It is more likely to stain than marble. Limestone is known to contain lime from sea water. Usually formed in light brown or red colors. Categorized by the most popular sandstone bonding agents such as silica, calcium, clay, and iron oxide. A very soft stone made of a variety of talc.