The anhydrous form is found in nature as the mineral berlinite.

The anhydrous form is volatile but the others are salts.

The anhydrous (no water molecules attached) form is needed most of the time.

The anhydrous form has not yet been found naturally.

Its anhydrous form gives it the added ability of absorbing moisture.

The way of achieving the anhydrous form differs from one substance to another.

The anhydrous form is much more stable against oxidation by air.

The anhydrous form is white and readily absorbs water from the atmosphere.

It exists both in anhydrous form and as a trihydrate.

It is commercially available in both the hydrated and anhydrous forms.