Grow a creepy crystal tree, create your own diamonds and make crystals that rock! Discover how crystals form and foul facts about crucial crystals. Contents of the Creepy Crystals kit are ammonium dihydrogen orthophosphate, tree growing solution, tree card, Petri-dish, colour tablet, seed crystal, round bottle, funnel, limestone rock and 'Horrible Info' leaflet. Suitable from 8 yrs+