Description This Collection contains 20 Types of Basic Minerals Specimens. The Minerals Specimens include Some of the following Agate, Amethyst, Barytes, Calcite, China Clay, Dolomite, Feldspar, Fire Clay, Fullers Earth, Graphite, Gypsum, Jasper, Magnetite, Mica, Pyrolusite, Pyrophilite, Quartz, Soap Stone, Sulphur, Tourmaline. Average sizes are 2 cm X 3 cm X 1.5 cm