CHEMICAL - these rocks are also called evaporites or inorganic precipitates. They result when ions precipitate from solution.


the rock is composed of NaCl(sodium chloride, halite) - rock salt halite2.gif (99687 bytes)

The rock is composed of calcium sulfate - the rock gypsum

gypsum1.gif (126185 bytes)

 

The rock is composed of calcite - limestone

Limes~48.jpg (15270 bytes)