Nicol prism
Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite which is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms. Chalk can also refer to other compounds including magnesium silicate and calcium sulfate.
Chemical formula for marble is CaCO3. Ca means calcium. C means carbon. O means oxygen. here it means 1 calcium, 1 carbon and 3 oxygen. They also call marble as calcium carbonate.
ammonium oxalate is added to calcium carbonate because in the reaction between the two a crystal is formed that contain the Ca+2 ion. This is useful because if you have a sample of sodium carbonate with an unknown molarity you can use the oxalate to extract this calcium and determine what the molarity of the unknown solution was
Limestone is a sedimentary rock composed largely of the minerals calcite and/or aragonite, which are different crystal forms of calcium carbonate (CaCO3).
Well as a chemist i would say it is. Most mineral samples are slightluy contamnated, whereas synthetic calcite is not.
Nicol Prism
sand dollar
Dolomite is a crystal of calcium magnesium carbonate, CaMg(CO3)2.
needle-shaped crystals of calcium oxalate as the monohydrate or calcium carbonate as aragonite, found in more than 200 families of plants.
Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite which is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms. Chalk can also refer to other compounds including magnesium silicate and calcium sulfate.
Chemical formula for marble is CaCO3. Ca means calcium. C means carbon. O means oxygen. here it means 1 calcium, 1 carbon and 3 oxygen. They also call marble as calcium carbonate.
In laboratory only one form; in the nature many minerals has the formula CaCO3. See also: http://en.wikipedia.org/wiki/Calcium_carbonate and http://www.webmineral.com/cgi-bin/search/search.pl.
Aragonite, a crystal form of calcium carbonate, is not widely used in manufacturing, as it is not stable at standard pressure or temperature. Calcium carbonate powder may be used in paints and adhesives, as well as a polishing agent for plastics and glass.
Limestone commonly predominantly contains Calcite and Aragonite which are the two crystal forms of Calcium Carbonate (CaCO3). It commonly also contains detrital clasts (broken pieces of other material) such as flint or chert which are silica. Some limestones also contain the mineral dolomite which is Calcium Magnesium Carbonate (CaMg(CO3))2.
ammonium oxalate is added to calcium carbonate because in the reaction between the two a crystal is formed that contain the Ca+2 ion. This is useful because if you have a sample of sodium carbonate with an unknown molarity you can use the oxalate to extract this calcium and determine what the molarity of the unknown solution was
The main sediment of limestone is calcium carbonate, which is primarily composed of the mineral calcite. It forms from the accumulation and compaction of the remains of marine organisms such as coral, shells, and skeletal fragments.
a lime stone is sedimenty rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).