Unit Size set
A basic, introductory unit of 75 rocks and minerals that demonstrate the major rock-forming minerals; minerals in the scale of hardness; the physical properties as shown by streak, luster, cleavage, and fracture; and specific gravity. Includes sections of ores of metals and non-metals and igneous, sedimentary, and metamorphic rocks. Specimens are about 3.2 × 1.9 cm and are number coded and keyed to a list. Includes streak plate, magnet, magnifier, and Rocks and Minerals study guide.