Searching for a solvate that changes its solvation property

Question

I'm looking for a solvate that changes its solvation property when being dried. One example of such a material is gypsum:

at temperatures up to 250°C it becomes γ-anhydrite which will slowly hydrate to a hemihydrate.
at temperatures above 250°C it becomes β-anhydrite which will not hydrate again.

However the temperature range is too high to use it as example in my thesis.

$\begingroup$ Info on hydrates here: lycaeum.org/mv/mu/MgSO4.html $\endgroup$
– Brinn Belyea
Commented Jul 26, 2014 at 16:53 — Brinn Belyea, Commented Jul 26, 2014 at 16:53

Uncle Al · Accepted Answer · 2014-04-27 14:52:10Z

Sodium sulfate hydrates,

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