Calcium carbonate (calcite), limestone, marble
** Calcium carbonate is a chemical compound with the symbol CaCO3
It occurs naturally as a sedimentary or metamorphic rock in many mountains and deserts. The names of the rocks that contain it are limestone, calcite and marble.
** Uses:
It is used in the cement industry.
It is used in the production of quicklime and hydrated lime
Paper Industry
It is used to extract iron from its ores
It is used to make some types of jams such as pumpkin and eggplant, by soaking them before boiling.
It is used to get rid of the effects of acid rain in lakes
It was used in the past to write on the board (the blackboard) until the ink pens and the whiteboard appeared
** Health use according to Wikipedia, the free encyclopedia:
It is mostly used in oral forms and is generally considered a nontoxic substance.
Extendedrelease in tablets, preservatives and as a therapeutic agent.
Calcium carbonate is employed as a pharmaceutical excipient, where it is often used in solid forms as a diluent, as a base in drugimpregnated dental preparations, as a preservative, as a dissolution aid in friable tablets, and as a volumeraising agent in sugar coatings. Therapeutic as an antacid and supplement for body calcium. It is used as a extender in oily and aqueous coatings.