Linked from
The 32 pages that link to Hydrate, each with the reason it gives.
Calcium oxalateRelated: Common calcium oxalate crystals contain structural water.
Borate mineralRelated: Many borate minerals contain structurally bound water.
Iron(III) sulfateRelated: Water of crystallization gives iron(III) sulfate several hydrated forms.
Zinc sulfateRelated: Crystalline zinc sulfate occurs with different numbers of water molecules.