Linked from
The 9 pages that link to Calcium sulfate, each with the reason it gives.
GypsumNarrower topic: Gypsum is the dihydrate form of this compound.
TofuRelated: It is a common tofu coagulant that produces a tender, mineral-rich curd.
Calcium oxideCompared with: Unlike quicklime, it is a sulfate rather than a basic oxide.
AnhydriteNarrower topic: Anhydrite is the water-free mineral form of this compound.
Calcium sulfideCompared with: It is a common oxidized sulfur counterpart to calcium sulfide.