Rock Science Kit

The Rock kit has 5 each of igneous, sedimentary, and metamorphic rocks: Igneous - Obsidian, Granite, Basalt, Scoria, Rhyolite; Sedimentary - Shale, Calcareous Tufa, Sandstone, Conglomerate, Limestone; Metamorphic - Slate, Marble, Quartzite, Gneiss, Shist.

If you want small, affordable kits to cover the basics, these are a great option. Specimens are large enough to see detail, and they come in a sturdy cardboard box with divided plastic tray. Storage isn't an issue in these compact kits.