Focus On Minerals FOCUS ON MINERALS introduces
many common minerals and their
gems. Texts and illustrations explain the physical properties useful in identifying different minerals. Th ey include crystal structure (shape), color, streak (mineral powders), luster (appearance in refected light), hardness, cleavage (breaks along
planes of weakness) and others. Precious gems and gemstones hold significant interest throughout our history. Humans advanced their standard of living and culture by progressive uses of ore
minerals and industrial minerals. Each of thirty plus minerals named in the book appears in a glossary with photograph and description.