Rock and Mineral Kit: The rock collection mineral gem kits includes 15 different rocks, it is good for the rock collector, geological studies, teacher or anyone who loves rocks. Suitable for tabletop decorations, also good for challenging children's imagination.Package Includes: 15 Unique Rock Samples (size from 10mm to 17mm) in a box, Galena, Bornite, Sphalerite, Magnetite, Cuprite, Psilomelane, Azuritene, Cinnabar , Chalcopyrite, llmenite, Specularite, Magnesite, Pyrite, Hematiet, Bauxite and so on.Educational Gift: This unique & educational gemstone / Crystals collection is a great gift. It is a must-have for beginners or experienced gem collectors and is also suitable for young science enthusiasts, especially those kids who is interested in geology.Irregular Tumble Stone: This beautiful collection of polished gemstones healing crystals is good for the beginner or seasoned gemstone collector.Great Science Gift for Kids: You can use it as a birthday gift, chrismas gift or Easter gift for. It have plenty of rocks to identify, nice quality and keep them entertained, it is and a great way to pass the time.Colour: as shownMaterial: oreSize: single ore size: 2.5~3.3cmPackage Contents:15 Kinds * Mineral Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.