Ключевые слова: agate, arrangement, box, boy, child, childhood, classroom, collecting, collection, colorful, crystal, desk, education, gemology, gemstone, geography, geology, hand, holding, interest, knowledge, learning, leisure activity, lesson, looking, magnifying, magnifying glass, microscope, mineral, mineralogy, nature, object, obsidian, pile, polished, preschool, quartz, research, rhinestone, school, schoolboy, science, semiprecious, set, shapes, stone, studying, various,