what are the uses of the mineral calcite?
488153
It's used in the building industry. It is also used in the making of metallurgical flux, fertilizers, fertilizer manufacture and in the chemical industry. Clear calcite crystals were used as prisms. Occasionally rough crystals are used in jewelry or as ornaments. If you have a nice one, you can have it as a mineral collection.
1044878
Cement, known as Portland cement, which is used in concrete is not calcium carbonate and is in fact a silicate compound. There is no similarity between the reaction of cement and the hydration of calcium oxide that is described in another answer here and the reaction that takes place when cement is mixed with water. The statement "If you add water to the CaO... it will form again CaCO3 capturing the CO2 dissolved in the water" is absolutely incorrect and does not describe the reaction of cement with water. \n\nThe elements of dry cement that you are refering to are:\ntricalcium silicate (3CaO × SiO2)\ndicalcium silicate (2CaO × SiO2)\n tricalcium aluminate (3CaO × Al2O3)\ntetra-calcium aluminoferrite (4CaO × Al2O3Fe2O3)\n\nAs you can see the only thing they have in common with calcium carbonate (CaCO3) is the CaO. In fact calcium carbonate is a raw material used in manufacturing cement, but the resulting chemical compound is NOT calcium carbonate and has no similarity. The raw materials used in manufacturing cement are limestone, shale or clay, and gypsum. These are heated in kilns to about 1550 degrees F. \n\nThe main chemical reaction that chemically combines cement and water (the water is incorporated into the molecular structure- it does not 'dry' out) is as follows:\n2 Ca3SiO5 + 7 H2O ---> 3 CaO.2SiO2.4H2O + 3 Ca(OH)2 + 173.6kJ  \n\n\nTo answer your question, yes cement is known to occur in nature. Geologists discovered a natural deposit in the 1960's that is about 12 million years old, that formed where an oil shale reacted with a limestone. The Greeks were probably the first to discover cement similar to what we know today. Here is a timeline:\nhttp://matse1.mse.uiuc.edu/concrete/hist.html
522083
one a day calcium plus \n\nin the brown bottle with diff colored line on the bottle
69632
Calcite, a form of calcium carbonate is one, and probably one of the most dramatic. Actually, every mineral except for those crystallized in the isometric system have a  double refraction. That's a consequence of directional anisotropy. Some have trirefringence, meaning three different refraction indexes.
1131534
---Deliquescent salts have a great affinity for surrounding moisture, and readily absorb water vapours to form a solution. E.g: calcium chloride; zinc chloride, magnesium chloride; sodium hydroxide(base); lithium chloride; ammonium nitrate; magnesium nitrate; lithium sulfide; magnesium iodide; and potassium chloride\n\n---Hydrated salts are those which contain water of crystallization - different  salts attract different number of water molecules. E.g: Na2CO3+10H2O ; MgSO4+7H2O;  CuSO4+5H20;  CoCl2+6H2O;  SnCl2+2H20;  nickel(II) sulphate;  aluminum nitrate ; lithium nitrate;  calcium nitrate;  CaCl2+6H2O;  and BaCl2+2H2O.\n\nCrystallization is the the process of the removal of a solid from a solution by increasing its concentration above the saturation point, such that excess solid separates out in the form of crystals. It is used in separation and purification of a substance.
313942
I forget my organic chem but\n\nammonia, calcium carbonate - a base is used to neutralize an acid - a base donates electrons and an acid collects them (i think, or vs/vs) \n\nboth can be used to separate other chemicals, or remove chemicals from mixtures\n\nAcids are often used as a catalyst to start a reaction like when producing explosives - and can be very dangerous\n\ncommon ex - bleach(acid) mixied with ammonia(base) produce a poisonous gas and heat which can actually cause sever damage to lungs
1113262
It is an Arrhenius base as it supplies OH- ions in solution.It reaccts with almost all acids.Some reactive metals are able to liberate hydrogen from it.It is corrosive on the skin and so it is known as caustic soda.The solid crystals are deliquesent and absorb water from the atmosphere.It is used as a econdary titrating agent as its 100% pure solution is difficult to prepare.
371278
A mineral deposit of calcium carbonate that precipitates from solution in a cave...
717028
oxidation of the calcium in the shell
714952
THE ROLE OF NUTRIENTS IN HUMAN HEALTH - MINERALS \n\n(Foresight Article)\n\n\nCALCIUM\n\nCalcium is needed for the formation of strong bones and teeth, and for controlling blood clotting mechanisms and to regulate the excitability of nerves and muscles. Sufficient calcium is thought to protect against allergies, viruses and tooth decay.\n\nLack of calcium can cause rickets, back pain, osteoporosis, osteomalacia, insomnia, irritability, nervousness, tension, uneven heartbeat, indigestion, stomach cramps and spasms, constipation, pre-menstrual tension and cramping of the uterus.\n\nCalcium is lost from the bones during bedrest and with people on high-protein diets. Invalids and people on high-protein intakes should supplement with dolomite tablets or bone-meal, and increase dietary sources of calcium.\n\nCalcium can be used as a natural painkiller and some authorities advise taking calcium and Vitamin D in the week prior to menstruation, and at the onset of labour.\n\nCalcium is found in: \nMilk, Cheese, Bone broth, Green veg, Egg, Dolomite, Bone meal.\n\n\nMAGNESIUM\n\nMagnesium is needed for the production and transfer of energy, for muscle contraction, nerve excitability and protein synthesis. It also assists in the function of many enzymes. \n\nLack of magnesium brings involuntary muscle movements - gross tremor and twitching - convulsions and delirium. Insomnia, irregular heartbeat, leg and foot cramps and bedwetting can occur. Calcium deposits are found in the arteries and stones may form in the kidneys.\n\nMental symptoms include depression, poor memory, confusion, disorientation, hyperactivity, irritability, anxiety and an increased sensitivity to noise.\n\nProblems with the foetus include congenital abnormalities, calcium deposits and other abnormalities of the heart cells. The newborn may suffer anorexia, convulsions and perinatal death. \n\nOnly 20% of the magnesium is left in refined (white) flour, and only 17% is left in polished rice.\n\nMagnesium is found in: \nMilk, Eggs, Green veg, Seafood, Whole grains, Dolomite.\n\n\nPOTASSIUM\n\nPotassium is needed to regulate blood pH, keep the water balance, ensure the acidification of the urine, and help nerve conduction and muscle contractions.\n\nA shortage brings nervous irritability, mental disorientation, fatigue, listlessness, insomnia, muscle weakness, irregular pulse, constipation, cramping of muscles, low blood sugar and coma.\n\nA shortage can be induced by diuretics.\n\nPotassium is found in:\nWhole grains, Wheat germ, Soya flour, Nuts, All fresh fruit, All vegetables.\n\n\nCOPPER\n\nCopper aids the development of brain, bones, nerve and connective tissue.\n\nLack of copper can cause porous bones, loss of hair, demyelination, heart damage and anaemia.\n\nCopper deficiency in the foetus can result in depressed growth rate, depigmentation, anaemia, fine fragile bones, ataxia, small brain and perinatal mortality.\n\nCopper deficiency is rare however, and copper in excess can be toxic. Copper water pipes, especially new ones, or even old ones in areas where the water is soft and acid, may increase the copper load. Women who are on the contraceptive pill, some fertility drugs or are using the copper coil tend to accumulate copper. Copper jewellery and cooking utensils or kettles can also increase the copper load. The Foresight Clinicians advise hair analysis to check the copper level.\n\nOnly 37% of the copper is left in white flour, and only 75% in polished rice.\n\nCopper is found in:\nWhole grains, Liver, Kidney, Brain, Green veg, Mushrooms, Gelatin, Dried Yeast, Oysters, Nuts & Seeds.\n\n\nIRON\n\nIron is needed to make haemoglobin, the substance in the red blood cells which carries oxygen in the blood. It aids resistance to infection.\n\nShortage of iron can lead to weakness, shortage of breath, excessive fatigue, depression, mental confusion and poor memory.\n\nIron deficiency in the foetus can cause eye defects, bone defects, brain defects and neonatal mortali
12946
Lime is calcium carbonate, which is what we use to make bone.  It is available from a wide variety of plants.\n\nCalcium doesn't just make bones, it is essential for other biological processes.  This is why you can lose bone mass - if you get low on calcium, the body will leech it from the bones for more important functions.\n\nIn chicken eggs, not only does the shell protect the embryo, the calcium is leeched from the shell to provide calcium for the growing chick.  By the time the chick is ready to hatch, the shell is thinned down enough for the chick to get through.
1129625
Here are some potential sources:\n\nhttp://www.bestcrystals.com/ulexite.htm\n\nhttp://www.northwestnatureshop.com/department/Rocks_and_Minerals/Rock_and_Mineral_Specimens/592.html\n\nI'm sure you could find more if you googled it like I did.
560444
If you're talking mining, you can get magnesium by mining the minerals dolomite, magnesite, brucite, carnallite, talc, and olivine.\n\nIf you're talking getting magnesium in food, green vegetables such as spinach provide it along with nuts, seeds, and some whole grains.
134865
calcium is easily dissolved by acid even weak ones. calcium carbonate in the bones will form compounds such as calcium chloride if reacted with hydrogen chloride or calcium sulphate if reacted with sulfuric acid producing carbon dioxide as a side product in the reaction. Simply put it dissolves away.
527375
Potassium is a mineral that is found naturally in foods and is necessary for many normal functions of the body, especially beating of the heart. Potassium chloride is used to prevent or to treat a potassium deficiency.
53270
sodium carbonate\n\nA white powdery compound, Na2CO3, used in the manufacture of baking soda, sodium nitrate, glass, ceramics, detergents, and soap.
1042758
Calcium is the chemical element in the periodic table that has the symbol Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a reducing agent in the extraction of thorium, zirconium and uranium. Calcium is also the fifth most abundant element in the Earth's crust. It is essential for living organisms, particularly in cell physiology, and is the most common metal in many animals.\n\nIT MAKES YOUR BONES STRONGER - and prevents osteoporosis