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"Minerals are the recorders of earth's history and messengers that promote the progress of human civilization. When ape-men picked up the first stones from the river beach and learned to shape them into suitable tools, the Paleolithic Age began. When Homo sapiens learned to process and improve stone tools and invented ground stone tools, mankind entered the Neolithic Age. Because of the discovery of natural copper and the ability to refine it and make utensils and weapons, the Bronze Age came. After accidentally smelting iron meteorites and mastering the iron-making technology, humans began to mine sand iron in large quantities, ushering in the Iron Age. In the industrial era, humans created a more colorful material civilization through the development and utilization of mineral resources. With the continuous development of rare metals to create components such as transistors and thermistors, we have entered the information age. By understanding minerals, learning mineralogy knowledge, and using minerals to continuously create more practical and richer tools, humans have moved from one civilization to a higher level civilization. Now, please follow this book and dive into the mysterious and beautiful underground world, and start a wonderful adventure about minerals and gems, ancient times and the future! "