m-state Crystals NaHCO3 Dark Room

Hello All,

About a Year Ago I made a batch of Celtic Sea Salt with saturated NaHCO3, I filtered the solution and let it dry slowly on a dark room.
About 2 weeks some star crystals beging to form on the surface:







After a month more star crystal form on the surface:






Then by the weight of the crystals on the surface the crystal formation sunk to the bottom of the beaker and they seem to re-dissolve again.
After more weeks pased another group of star crystals start forming on top of the surface and again sunk under they own weight:






The walls of the beaker have growing crystals from the evaporation some of them go even outside the beaker: