Limestone

LIMESTONE
 Limestone is defined as a rock of sedimentary origin composed principally of calcium carbonate or the double carbonate of calcium and magnesium, or a combination of these two minerals. Recrystallized limestone, compact microcrystalline limestone, and travertine that are capable of taking a polish are promoted, marketed and sold as either limestone or marble particularly in the United States. Dimension limestone is divided into there sub- classifications that describe their densities in approximate ranges, as
follows: 
● LOW DENSITY – Limestone having a density ranging that 110 through 135/ib/ft3 (1760 through 2560 kg/m3 ).
●MEDIUM DENSITY-Limestone having a density greater that 135 and not greater than 160 ib/ft3 (2160 through 2560 kg/m3).
●HIGH DENSITY-Limestone having a density greater than 160 ib/ft3 (2560 kg/m3).
Limestone contains a number of distinguishable natural characteristics, including calcite streaks or spots, fossils or shell formations, pit holes, reedy formations, open texture streaks, honeycomb formations, iron spots, travertine-like formations and grain formation changes. One or a combination of these characteristics will affect the texture.