Take them places if they are small enough
let them sit in rice for 72 hours to 'clear' them and don't forget fanning them as soon as you get them with incense like nag champa or sage to get all traces of industry and negative postal workers off your crystal
Meditate with them and give them a special place in your home
Don't just waste our friends.....so let YOU be their rave through the millenia they have been alive and also plan for a place to bury them or somebody to keep them after your departure-start a legacy for young ones - collect crystalz :)
They were put here by aliens to help us