Minerals are what rocks are made of, and here's a set of 15 AESTHETIC minerals! All specimens have been hand-picked for beauty and other characteristics. Labelled and numbered. Box included--measures 11" x 7 x 1-1/2". Includes opal, quartz, talc, sphalerite, pyrite, galena, labradorite, calcite biotite mica, tiger iron, malachite, gypsum, chalcedony, muscovite mica, and kaolinite.