you can try to use rubbing alcohol and press it back together. Try going on youtube there are many guru's on there that show you how to press it back together.
What I suggest is smash all the pieces into powder and press it back together. Hope that helps!
Grind it up, pop it into a powder sifter and use it as a loose powder.
Mineral products don't rebind together with alcohol particularly well; a certain element of heat and pressure is needed to get them to really bond back together. You can use alcohol and press it, but it will be weak and more likely to break again.