[[Datoteka:Gypsum Australia.jpg|thumb|left|200px|Gips iz Novog Južnog Velsa, Australija]]
<!--Gypsum occurs in nature as flattened and often [[crystal twinning|twinned]] [[crystal]]s and transparent cleavable masses called [[selenite]].t It may also occur silky and fibrous, in which case it is commonly called ''satin spar''. Finally it may also be granular or quite compact. In hand-sized samples, it can be anywhere from transparent to opaque. A very fine-grained white or lightly-tinted variety of gypsum is called [[alabaster]], which is prized for ornamental work of various sorts. In arid areas, gypsum can occur in a flower-like form typically opaque with embedded sand grains called [[desert rose (crystal)|desert rose]].-->
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Gypsum is a very common mineral, with thick and extensive [[evaporite]] beds in association with [[sedimentary rock]]s. The largest deposits known occur in [[stratum|strata]] from the [[Permian]] age. Gypsum is deposited in lake and sea water, as well as in [[hot spring]]s, from [[volcano|volcanic]] vapors, and sulfate solutions in veins. [[Hydrothermal]] [[anhydrite]] in veins is commonly hydrated to gypsum by groundwater in near surface exposures. It is often associated with the minerals [[halite]] and [[sulfur]].-->
Red 73:
Gypsum can also be recovered and re-used from scrap drywall at construction sites.-->
<!--Gypsum is also a by-product of the [[phosphorous|phosphate]] [[fertilizer]] refining process. Phosphate ore is mixed with [[sulfuric acid]] to produce [[phosphoric acid]]. The phosphoric acid is then [[ammonia]]ted to form [[monoammonium phosphate]] (MAP) and [[diammonium phosphate]] (DAP). The resulting waste product is a slurry of calcium sulfate (gypsum), that eventually dries and hardens. In fact, the phosphate industry creates several times more gypsum as a by-product than is produced or required by the commercial gypsum industry. In the case of the phosphate industry in West Central [[Florida]], this gypsum by-product is prohibited from commercial use because of low levels of naturally occurring [[radioactivity|radioactive]] material (NORM) existing in the phosphate ore that becomes technically enhanced and deposited into the gypsum. Because of the sheer volume of gypsum produced by this process, there is also a considerable lobbying effort by the gypsum industry not to allow the phosphate byproduct on the market. {{Fact|date=February 2007}} The result is huge piles of gypsum waste that are visible along the highways in the vicinity of the Florida phosphate refineries.-->calc
<!--Because gypsum dissolves over time in water, gypsum is rarely found in the form of sand. However, the unique conditions of the [[White Sands National Monument]] in the US state of [[New Mexico]] have created a 710 km² (275 sq mile) expanse of white gypsum sand, enough to supply the construction industry with drywall for 1,000 years.<ref name='The Albuquerque Journal 1999-02-07'>{{cite news | last = Abarr | first = James | title = Sea of Sand | pages = | publisher = The Albuquerque Journal | date = [[1999-02-07]] | url = http://www.abqjournal.com/venue/travel/tourism/heritage_whitesands.htm | accessdate = 27. 01. 2007. }}</ref> Commercial exploitation of the area, strongly opposed by area residents, was permanently prevented in 1933 when president [[Herbert Hoover]] declared the gypsum dunes a protected national monument.-->
