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| Limestone, a sedimentary stone came from the organic elements of plants, glaciers, rivers and oceans. After forming rock beds, they were bonded by heat and pressure over millions of years. It mostly consists of calcite and contains lime from seawater. It reveals little crystalline structure and has a smooth granular surface. The common colors are white, gray, green-gray, yellow, beige, brown and black. It typically has a honed matte finish or subtle sheen. Due to the lesser degree of hardness, it is usually not polished but some dense limestone can be. Like marble, limestone is more appropriate for decorative applications. It is visually more understated than many types of marble. | |||||||||||||
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| Slate, another metamorphic stoneis finely grained and formed from shale, clay and other sedimentary rock. Created under relatively low pressure and heat, it is not as hard as granite, marble or limestone. Even though it is strong and durable, it splits easily and is typically used for roofing, flooring and blackboards. It can also be used for tabletops. The range of hues is not as wide as the other stones and the shades tend to be darker. The black, blue and gray colors come from the presence of iron sulfide and other carbonaceous materials. The purple and reddish colors contain hematite {iron oxide}. Chlorite, which is micaceous clay, gives it its green color. The other principal minerals present are mica scales, chlorite flakes, and quartz grains. Slate is not hard enough to polish therefore it is left in a honed state. | |||||||||||||
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