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Genesis and Classification of Agates and Jaspers: a New Theory (book in english)

Genesis and Classification of Agates and Jaspers: a New Theory (book in english)

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Genesis and Classification of Agates and Jaspers: a New Theory by Marco Campos-Venuti in English Deciphered one of the biggest mysteries of geology! A guide to the collector. A Bible for the geologist. This book shows a new geological model that explains the formation of most of the microcrystalline and amorphous varieties of silica. It has been written for the collectors, the geologists and for the curious, analyzing many collectible varieties of jaspers, agates and chalcedonies. The use of a geological and stratigraphic innovative approach to the theme, leads to the consequence that most of the concepts are original. Jasper and Chalcedony result to be two silica polymers. Jasper and Chalcedony are two silica polymers. They are formed as concretions in surface rocks. This leads that silica varieties take their origin in a meteoric environment with a strong influence due to the weather and the alternation of dry and wet seasons. Uncountable situations are possible due to the many parameters as the host rock, the pH of the water and the latitudes, that explain the numerous existing varieties of silica. Explication of the involved phenomena is ruled out with the help of an endless number of pictures and diagrams that capture and maintain the attention of the reader. The author born in 1965. Is a PhD volcanologist and editor of the Rivista Gemmologica Italiana. Since his childhood he is a passionate collector of stones, and was always curious to investigate their origin. He has an important collection of agates and jaspers and has written innumerable scientific papers. YOU WILL FIND ALL THE ANSWERS ABOUT: AGATES Genesis of the first chalcedony layer Origin of mosses and plumes Formation of bands Primary and secondary colors Connective channels and interruptions of the bands Horizontal and concentric banding Quantitative analysis Morphology of the bands Stratigraphy of a banded agate Influence of climatic conditions Types of agate depending on host rock Origin of colored chalcedony without bands Banded agates without the first chalcedony layer Lace and Beacon Agates JASPERS Classification of Jaspers Flints and abyssal jaspers Genesis of orbicular jaspers Precursors of jaspers Thunder egg formation Orbed jaspers Brecciated jaspers Jasp-agates Chemical disequilibrium between jasper and chalcedony Classification of non-crystalline silica You can have your copy signed by the author for free. Just ask. More info at AGATESANDJASPERS(dot)COM !!!!!!!!!!!!!!!!!IMPORTANT!!!!!!!!!!!!!!!! The book will be shipped without tracking because of high cost of fast shipping with tracking. Shipping with tracking is 24 euro (=30 dollars) and without tracking is 8.5 euro (=10 dollars). Because I will pay the shipping, your book will be shipped without tracking. This shipping will probably last more than 1 month. So you need to be patient and wait it at home. Don't worry, it will arrive at destination. I shipped more than 500 copies of the book and no one has been lost. Few of them has lasted more than 1 month, but the majority around 3 weeks. Please be patient and sorry in advance.