Rock and Mineral Kit: collection mineral gem kits includes 15 different , it is good for , geological studies, teacher or anyone who loves . Suitable for tabletop decorations, also good for challenging children's . 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 gemstones crystals is good for the beginner or seasoned gemstone . Great Science Gift for Kids: You can use it as a birthday gift, chrismas gift or Easter gift for. It have plenty of to identify, quality and keep entertained, it is and a great way to pass the time. Colour: as shown Material: Size: single size: 2.5~3.3cm Package Contents: 15 Kinds * Mineral Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.