>>12384192I phrased it a little imprecisely.
I am not sure if a change of the crystal structure can be called a change of the aggregate state.
I guess thats no more correct.
probably one must already speak of thermodynamic phase here.
the difference is, that here changes of the state variables define if there is another phase.
that is, quantities such as density, pressure, temperature, substance concentrations.
picrelated shows an expample for two liquid phasis. state variable difference is substance concentration here.