LIMESTONES: is a sedimentary rock composed largely of the mineral calcite (calcium carbonate: CaCo3). Limestone's often contain variable amounts of silica in the form of chart or flint, as well as varying amounts of clay, silt and sand as disseminations, nodules, or layers within the rock. The primary source of the calcite in limestone is most commonly marine organisms.These organisms secrete shells that settle out of the water column and are deposited on ocean floors as pelagic ooze or or alternatively is conglomerated in a coral reef (see lysocline for information on calcite dissolution). Secondary calcite may also be deposited by supersaturated meteoric waters (groundwater that precipitates the material in caves)
TYPES OF INDIAN LIMESTONES
Kota Blue Natural, Kota Blue Polished, Kota Brown Natural, Kota Honey or Kota Brown Rusted, English Teak Limestone, Cudappah Black Limestone, Kota Black, Yellow Limestone, Kadapa Black