Crystals of gypsum are tabular and diamond-shaped, but massive, granular and fibrous habits are also common. Many forms have specific names: transparent tabular crystals are referred to as "selenite", radiating aggregates (such as those illustrated) are known as "daisy gypsum", fibrous gypsum is called "satin spar", whilst fine-grained aggregates are known as alabaster.

When heated and crushed, gypsum is used to make "Plaster of Paris". Alabaster is used as an decorative stone; its softness allows it to be carved easily.