Plaster which has a greater percentage of the water of crystallization removed than normal gypsum plasters; used as a finish

Gypsum from which all the water of crystallization has been removed.

A natural mineral calcium sulfate, used in the manufacture of portland cement to control its set.

Aggregate, the particles ofwhich possess well-defined edges formed at the intersection of roughly planar faces.

A unit of length; used to express electromagnetic wavelengths; 1 = 1010 meter = 1 €ž10 nanometer. Abbr. .