Gypsum

Gypsum was a white mineral substance used in creation of plaster and alabaster.

Description
Gypsum was a relatively soft mineral. A test can be used to determine its authenticity – gypsum could not be scratched by a fingernail but rather by using a copper or bronze coin. Satin spar was a type of gypsum mineral, also known as feather gypsum, was used in gem-cutting.

Usage
The city of Ankhapur in the Land of the Lions had its walls tarnished in white gypsum.

The Mulhorandi deity Geb had his temples constructed to be living cavers filled with arrows minerals, including gypsum flowers.

Availability
Gypsum was found within desert rocks of the great desert of Anauroch in North Faerûn. Deposits of the white substance were broken off and harvested by the Bedine humans along with the less valuable gypsum dust.

Aurora's Whole Realms Catalogue sold gypsum in eight-ounce bags for a single silver piece, available from the Wizard's Laboratory of the catalogue.

Crystal flowers of the Underdark wer beautiful natural mineral formations of halite, gypsum, and other substances. They were valued by the sentient inhabitants of the Underdark for their beauty.

Scales of radiant dragons were comprised of glistening mica and gypsum.