We are offering brown limestone. limestone is a sedimentary rock, made up mostly of the mineral calcite, a form of calcium carbonate, caco3. The calcium carbonate is originally produced by living animals (such as shellfish). Later, much of it goes into solution in sea water, and then is deposited as limestone. Calcium carbonate gets precipitated when the physical condition of the water changes. For example, if the concentration of caco3 is high, then a temperature drop, or a ph (acidity) change, can cause precipitation. limestone refers to sedimentary rocks that contain a minimum of 50 percent of calcium carbonate in their composition. Minor components include clay, iron, feldspar, and quartz. Limestone is formed by the deposition of calcium carbonate suspended in the water or by the accumulation of shells and other fossilized materials. Limestone rock types include chalk, coquina, travertine, tufa, as well as oolitic and lithographic limestone. chalk and coquinachalk and coquina are two fossiliferous limestones, which can contain fossils. Chalk is soft, white to light gray in color and has a extremely fine texture. The remains of the calcareous shells of prehistorical and microscopic marine organisms formed this type of limestone rock. The white cliffs of dover, in england, are an example of chalk. On the other hand, coquina has a rough texture, because it is the results of the cementing of debris of broken shells and corals. The anastasia geologic formation, in florida, is an example of coquina that was formed more 10, 000 years ago. oolitic limestonethis type of limestone rock consists of small spheres. When primitive oceans were saturated with calcium carbonate, the mineral's small particles started to aggregate around grains of sand, forming the oolitic limestone. Florida's lower keys contain oolitic limestone. In britain, the cotswold area is famous for its old houses built with yellow oolitic limestone, which was formed 150 million years ago. travertine and tufatravertine is a white to yellow limestone often found in caves or near water sources. It is formed when the calcium carbonate dissolved in the water accumulates over time on rock surfaces, producing cave formations such as stalactites. In the u.s., travertine formations are found in several locations, including the mitchell caverns, at the mojave national preserve, california. Plitvice lakes national park, in croatia, is an example of travertine formation associated to waterfalls. Similar to travertine, tufa is a type of limestone often linked to hot water springs. lithographic limestonelithographic limestone was formed about 150 million of years ago, during the jurassic period. It is a dense and fine-grain type of rock, which became important in the late 1700s with the advent of a printing process called lithography. Artists drew images on the stone using a special oily ink, and pressed onto sheets of paper. One single drawing could generate many paper copies. The first lithographic limestone was found in southern germany.
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