gypsum - meaning and definition. What is gypsum
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What (who) is gypsum - definition

MINERAL, CALCIUM SULFATE WITH BOUNDED WATER
CaSO4·2H2O; Gipsum; Calcium sulfate dihydrate; CaSO4*2H2O; Sulphate of lime; Lime sulphate; Desulpho-gypsum; Desulphogypsum; Gypsum mining
  • Gypsum works, [[Valencian Museum of Ethnology]]
  • Old [[Alfarb]] kiln for making plaster as a construction material
  • Map of gypsum deposits in northern Ohio, black squares indicate the location of deposits, from ''"Geography of Ohio"'', 1923
  • Gypsum crystals are soft enough to bend under pressure of the hand. Sample on display at Musée cantonal de géologie de Lausanne.

gypsum         
['d??ps?m]
¦ noun a soft white or grey mineral consisting of hydrated calcium sulphate, used to make plaster of Paris and in the building industry.
Derivatives
gypsiferous -'s?f(?)r?s adjective
Origin
ME: from L., from Gk gupsos.
gypsum         
n.
Sulphate of lime (native).
Gypsum         
·noun A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

Wikipedia

Gypsum

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and drywall. Alabaster, a fine-grained white or lightly tinted variety of gypsum, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It forms as an evaporite mineral and as a hydration product of anhydrite.

The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison.

Examples of use of gypsum
1. Gypsum is also safer and more resistant to earthquakes.
2. Gypsum is a mineral used in the building industry.
3. Their headlamps illuminate mud–covered walls, gypsum crystals and mineral deposits.
4. It is a common misapprehension that gypsum wallboard is not sufficiently strong or insulating.
5. And sinkholes form periodically as the gypsum dissolves beneath the structure.