Limestone-B

By Dana Boor and Zach Puls

Limestone

====Limestone has many minerals in it. Chemical Limestone contains the minerals calcite, aragonite, and different forms calcium carbonate. Organic limestone contains silica, clay, silt, and terrestrial detritus(these are found in the marine organisms that form the rock). ====

The chemical formula for chemical limestone is CaCO3.

Limestone has many uses. The main use is in building material. The Egyptians used a form of limestone to build the great pyramids. In the 20th century banks and train stations where build from Limestone. It is also used in cleaning chemicals.

====Limestone is a uniform rock. It has a fine grain size. It is also angular. Organic Limestone contains sea shells that have fallen to the floor of the body of water. These fossils can tell us about the past(another use). ====

====Now for some interesting facts about limestone. Iowa is full of limestone. One of the most obvious places to find limestone in Iowa is in Legends State Park. Looking at the high walls of the canyon you will see nothing but yellow limestone. If you look close enough you may see tiny sea shells. This is because the the limestone in Legends Park is organic. ====

 Here are some pictures of limestone.

Sources: Prentice Hall //Earth Science// book. geology.about.com guptagrinding.com wikipedia.org