A. Holden, “The Nature Of Solids” Paperback. An introduction to the basic principles needed to understand the properties of solid. Readers with little Science background may find parts of this text somewhat technical.
A. Holden and P. Morrison, “Crystals and Crystal Growing”. Paperback. A simple discussion of crystals and some of their properties. This book contains some nice discussions of simple experiments which could be done with a class.
F.H. Pough, “A Field Guide To Rocks and Minerals”. Paperback. An introduction to aology and the methods of identifying minerals. Some nice color photos.
E.A. Wood, “Crystals—A Handbook For School Teachers”. Paperback. A concise discussion of a number of simple experiments which can be done in class. Simpler than Holden and Morrison with primary emphasis on the experiments.
E.A. Wood, “Crystals and Light” (1977). Paperback. An excellent introduction to the optical properties of crystals.