Does anyone know an easy way to make cristal grow, by dilution of a chemical compound in a liquid ? And maybe too, if there is a list to which form of the cristal corresponds to which powder ?

Crystal growth by dilution?

 

Usually you want to concentrate a chemical compound to cause crystallization.

 

I've never heard of a liquid-liquid demixing with the liquid then immediately crystallizing.

It isn't exactly dilution, but you can add ethanol or acetone to a concentrated aqueuous solution of a salt to make it precipitate. Ethanol is miscible with water, but the salt's solubility decreases dramatically in the mixture.

 

To get a list of lattice structures/growth habits for different minerals and powders, the best site I can recommend is :

 

http://webmineral.com/

 

 

McCrunchy