The Ultimate Guide to Quartz (The Ultimate Guide to Gemstones) odf de graça baixar
por Hans J Steinberg
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Descrição do livro
Quartz is one of the most common minerals on Earth, yet few materials display such an extraordinary range of colors, structures, inclusions, and uses. The Ultimate Guide to Quartz is a practical and accessible reference for collectors, gem enthusiasts, jewellers, students, and anyone interested in understanding this remarkable mineral in greater depth. From transparent rock crystal and vivid amethyst to citrine, smoky quartz, rose quartz, chalcedony, agate, jasper, and included varieties, this book explores the quartz family from both geological and gemological perspectives. Discover how quartz forms in igneous rocks, hydrothermal veins, cavities, geodes, sedimentary environments, and metamorphic systems. Learn why quartz is so abundant, how different varieties develop their distinctive colors, and how inclusions such as rutile, tourmaline, chlorite, hematite, and trapped fluids can record the geological history of a crystal. The book also examines the practical side of quartz identification and valuation. It explains hardness, refractive index, specific gravity, magnification, birefringence, spectroscopy, and other testing methods, while showing how to distinguish natural quartz from treated, synthetic, composite, and imitation material. Readers will learn how color, clarity, cut, crystal habit, locality, provenance, inclusions, rarity, and condition influence quality and value. Separate attention is given to collecting, buying, investing, lapidary work, jewellery use, cleaning, storage, and long-term care. Major quartz-producing regions are explored alongside the historical and scientific importance of quartz, including its use in ancient carving, engraved gems, mineral collecting, crystallography, piezoelectricity, watches, electronics, and modern technology. Whether you are examining a single amethyst, building a mineral collection, buying quartz gemstones, studying gemology, or simply curious about one of the Earth's most important minerals, The Ultimate Guide to Quartz provides a clear foundation for understanding what makes quartz both ordinary and exceptional.
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