Collecting Rocks, Gems and Minerals: Identification, Values and Lapidary Uses

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Unlike the dense and highly technical academic tomes that are text-heavy, poorly organized and intimidating, this colorful and easy-to-use reference guide dedicated to collecting rocks, gems and minerals is ideal for readers who want to expand their understanding without getting lost in a labyrinth of science. Beautifully illustrated with 700 color photographs providing wonderful detail and smartly organized to take the hassle out identification, you will enjoy the simplicity of the guide and the enthusiasm and knowledge of author Patti Polk, one of the top agate collectors in the world and a self-proclaimed "rockhound." You will also enjoy two areas that our competitors don't bother with. First it includes values, and second, it covers an introduction to lapidary, which is the cutting and polishing of rocks and gemstones for jewelry or display.
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About the author

Author Patti Polk is recognized as one of the top agate collectors in the world (as noted in the highly respected reference book Agates III by Johann Zenz). She has been collecting, cutting and polishing rocks for jewelry and display for more than 20 years. She has been published in Rock & Gem magazine and numerous other periodicals, and speaks at rock and mineral club programs and frequently serves as a trail guide for visitors to Arizona. Patti is a skilled lapidary artist, which includes the cutting and polishing of the stones into display specimens or cabochons for jewelry making.
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Additional Information

Publisher
Penguin
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Published on
Apr 6, 2016
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Pages
352
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ISBN
9781440246197
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Features
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Language
English
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Genres
Antiques & Collectibles / General
Nature / Rocks & Minerals
Reference / Research
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Content Protection
This content is DRM protected.
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Eligible for Family Library

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Gemmology is a text for students preparing for the Gemmological Association's Preliminary and Diploma examinations. The book is more expansive and up-to-date than the author's earlier book, Beginner's Guide to Gemmology.
The book deals with the practical and theoretical sides of gemmology. Tracing the background and science of gemmology, the book covers the gem material, geological formation, and occurrence of gemstones on the earth. The composition of gemstones from the atoms, elements, molecules, and compounds comprising them is analyzed, and the relationship between chemical composition and durability of the stone is explained. The basics of crystallography is mentioned as a tool toward understanding gemmology after which cleavage, parting, and fracture are done. A gemstone's durability and hardness and how the latter influences engineering tests and the mining techniques are compared. An important test technique to identify unmounted stones is the measure of specific gravity using displacement measurement methods and hydrostatic methods. After more descriptive details are given in identification of gemstones, whether these are synthetic or simulants, through a comprehensive explanation of the materials found in these other gemstones, the fashioning, through shaping or polishing, of gemstones is explained. Emphasis is given on the critical angle in which light rays pass in different rock densities, and then the cutting styles, gemstone polishing, and grading are discussed.
Students studying for the Gemmological Association's Preliminary and Diploma examinations, jewelers, lapidarists, and diamond cutters, as well as those engaged in the hobby of gemmology, will find this book helpful and full of information toward their endeavors and hobbies.
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