Burchett, R. R., Carlson, M. P., Mohlman, D. R., 1994, revised 2005. Nebraska’s Common Rocks (GIM-76b) size 9" x 4.5" x 1.5" plastic box, contains 21 samples in 15 compartments. Description: The "K-12" collection is ideal for elementary and secondary Earth-science instruction. Samples include: coal, limestone, fossiliferous limestone, shale, sandstone, Ogallala "quartsize," flint/chert, ironstone, basalt, selenite, pyrite, granite, loess, quartz, dune sand, sand/gravel, Sioux quartzite, volcanic ash, prairie agate (state rock), Holdrege soil (state soil) and blue chalcedony (state gem). A two-page descriptive brochure is included. Comes with a two-page 8.5" x 11" (photocopied) brochure.