Mohs Scale of Hardness- Geologist's Hip Flask

This educational geology hip flask features the Mohs Scale of Mineral Hardness. For a quick reference, this chart features the ten minerals of the Mohs scale, listing their hardness number (1-10), mineral name (talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond), and their respective chemical formulas. It also includes the positioning of several handy reference items (fingernail, penny, iron nail, glass, and streak plate). This is a handy item for a beginning mineralogist or rockhound.