<unk> tone quarry in Brønnøy, Norway<unk> is a calcium-containing inorganic mineral composed primarily of oxides, and hydroxide, usually calcium oxide and/or calcium hydroxide. It is also the name for calcium oxide which occurs as a product of coal-seam fires and in altered<unk> tone xenoliths in volcanic ejecta. The word<unk> originates with its earliest use as building mortar and has the sense of sticking or adhering. These materials are still used in large quantities as building and engineering materials (including<unk> tone products, cement, concrete, and mortar), as chemical feedstocks, and for sugar refining, among other uses.<unk> industries and the use of many of the resulting products date from prehistoric times in both the Old World and the New World.<unk> is used extensively for wastewater treatment with ferrous sulfate. The rocks and minerals from which these materials are derived, typically<unk> tone or chalk, are composed primarily of calcium carbonate. They may be cut, crushed, or pulverized and chemically altered. Burning (calcination) of these minerals in a<unk> kiln converts them into the highly caustic material burnt<unk>  unslaked<unk> or quicklime (calcium oxide) and, through subsequent addition of water, into the less caustic (but still strongly alkaline) slaked<unk> or hydrated<unk> (calcium hydroxide, Ca(OH)2), the process of which is called slaking of<unk>  When the term is encountered in an agricultural context, it usually refers to agricultural<unk>  which today is usually crushed<unk> tone, not a product of a<unk> kiln. Otherwise it most commonly means slaked<unk>  as the more dangerous form is usually described more specifically as quicklime or burnt<unk>
Lime 
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