SET 3: Minerals (Kit 7) —Geodes (Kit 8) — Fossils (Kit 9) EARTH SCIENCE EXPERIMENTS BROUGHT TO YOUR HOME. Grow a salt rock garden, rock candy, and string crystals. Break open a large geode. Identify five unknown minerals using the streak, hardness, magnetic, and acid tests. Study a fossil. Complete this set by making a cast and a mold fossil that will impress any budding scientist.