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.
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|DAILY BEAST
The presence of the gypsum tends to delay the slaking of the lime, and also to harden the substance formed after the slaking.
Other minerals that have been discovered but have not been industrially developed are gypsum, lignite and cement rock.
Magnesian limestone, gypsum, and rock-salt, occur among the superior strata of this group.A Manual of Elementary Geology|Charles Lyell.
At the same time a quantity of gypsum was produced and burned in the charcoal fires which were then roasting the teas.Curiosities of Civilization|Andrew Wynter
It is not so brittle as nitre; it is nearly as hard as alum, a little harder than gypsum, and softer than calcareous spar.A Dictionary of Arts, Manufactures and Mines|Andrew Ure