Learn about geology & start your own rock collection. Use the guide to identify your specimens & discover whether they are igneous (made by fire), sedimentary (formed in layers) or metamorphic (rocks that change). Experiment with floating rocks, make rocks fizz & bubble & discover a substance that eats rock. Contents: sample of blue azurite, obsidian, granite, sandstone, marble, scoria, pyrite (fool's gold), limestone, cyanite, chalk, hessian bag, rock collection case, magnifier, guide.