History Of Lime Stone
Limestone is the sedimentary
rocks which largely consist of mineral
calcite. It mostly contain variable amounts
of silica in the form of flint and varying
amounts of clay, silt, sand, nodules and/or
layers within the rock. The basic purpose
of calcite in limestone is marine organism.
This marine organism secretes shells that
settle out of the water column and deposits
the ocean floor as pelagic ooze in the
coral reef. It deposits supersaturated
meteoric water. It produces speleothems
like stalagmites and stalactites.
Mostly pure limestone will
be in white. Different colors of limestone
are exhibited, because of the impurities
of clay, sand, organic remains, iron oxide
and other materials. It may be crystalline,
clastic, granular or massive depending
upon the formation. To describe limestone,
Folk and Dunham classifications are used.