Mini Me Geology Tumbled Rock - Approximately 1 Lb. Of Assorted Large Rock and Mineral Samples Assorted Tumbled Rocks, Crystals and Minerals - approximately 1 pound Decorative rocks for home decor and crafts. This collection of rock and mineral crystals are tumble to a high shine which are perfect for home decoration. Tumble Rock are perfect for geologic study, classrooms and home school. Each tumbled mineral crystal is polished to a high shine. 0.75" to 1.0" Rock and Mineral Specimens This beautiful assorted mix of tumbled stone may include amethyst, quartz, citrine, sodalite, orange calcite, rose quartz, hematite, smoky quartz, carnelian, green quartz and onyx.