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gypsum
Gypsum is a very soft mineral compose of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O.
Trivia about gypsum
Drywall is also called gypboard, the "gyp" short for this
Alabaster is a variety of this rock (that would make a good law partner for Cheatum)
The white sands of New Mexico's White Sands National Monument are this plaster material
(Jon of the Clue Crew holds a white rock at White Sands National Monument, New Mexico.) Because it's water-soluble, this form of calcium sulfate is rarely found in sand, but here in New Mexico's Tularosa Basin, there are no rivers to carry it away, so it forms the famed white sand