Travertine -
A sedimentary rock that began as limestone (calcium carbonate), which over time was heated by the Earth’s core, releasing pressurized water and steam to form hot springs. The rising hot water would dissolve the limestone and bring with it granules of stone from below the surface that collected into mud baths. When this mud cooled, it would crystallize into solid stone, now called travertine. The stone is often light in color and beautifully banded as a result of the presence of iron compounds or other organic impurities
Limestone -
Limestone is a common sedimentary rock composed primarily of the calcium carbonate mineral, calcite (CaCO3). Limestone constitutes approximately 10 percent of the sedimentary rocks exposed on the earth’s surface.
Limestone is formed either by direct crystallization from water (usually seawater), or by the accumulation of sea animal shells and shell fragments. In the direct crystallization case calcium ions in the seawater combine with atmospheric or dissolved carbon dioxide to form calcium carbonate, which being insoluble, precipitates out. Over time, layers of the calcium carbonate form, and with sufficient time and pressure from overlying materials, are transformed to solid rock.
Slate -
A fine grained metamorphic stone that formed from clay, sedimentary rock shale, and sometimes quartz. Very thin and can break easily. Usually black, grey or green. Slate is used for flooring and such bathroom applications as shower stalls, floors and walls.
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