- a very common mineral, hydrated calcium sulfate, CaSO4⋅2H2O, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris, as an ornamental material, as a fertilizer, etc.
Origin of gypsum
Examples from the Web for gypsum
Fracking, in this regard, is no different from gypsum mining, or some kinds of industrial agriculture.New York’s Conservative Fracking Ban
December 20, 2014
The sand dunes were relentlessly mined in the past century; power lines and a gypsum plant split the park.Why Do We Save Some Species and Let Others Get Devastated?
Melissa Holbrook Pierson
May 21, 2013
Green and red marl, shale, and shaly limestone with some veins of gypsum.
Beds of gypsum have been discovered on the head waters of the Pere Marquette.
To every hundred pounds of this powder, about three pounds of gypsum is added.Diggers in the Earth
Eva March Tappan
The United States is the largest producer of gypsum in the world.
Production of gypsum in the United States comes from eighteen states.
- a colourless or white mineral sometimes tinted by impurities, found in beds as an evaporite. It is used in the manufacture of plaster of Paris, cement, paint, school chalk, glass, and fertilizer. Composition: hydrated calcium sulphate. Formula: CaSO 4 .2H 2 O. Crystal structure: monoclinic
Word Origin and History for gypsum
substance (hydrated calcium sulphate) used in making plaster, late 14c., from Latin gypsum, from Greek gypsos "chalk," according to Klein, perhaps of Semitic origin (cf. Arabic jibs, Hebrew gephes "plaster").
- A colorless, white, or pinkish mineral. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks, especially those formed through the evaporation of saline-rich water. It is used in manufacturing plasterboard, cement, and fertilizers. Chemical formula: CaSO4·2H2O.