I have heard about this at school fairs, but have never seen it and don't know how to make one, and would REALLY like to do one for my son's birthday party this weekend (yes, not much time, I know). He's turning 6.
the idea is to have a tea chest (plywood box) and paint it dark blue with glitter and put smallish crystals in with plaster of Paris then the children (gnomes, dwarves, whatever) go crystal mining with head torches and hammer the crystals out.
Any ideas and/or practical suggestions?
Anyone know how long it would take for the plaster to set, how easy it will be to hammer the crystals out without breaking them, etc.?