Genesis and clasification + Banded Agates. Two books Special Offer.

Description

Genesis and Classification of Agates and Jaspers: a New Theory +
Banded Agates a genetic approach
by
Marco Campos-Venuti
Books in
English
For the collector, the geologist, the scholar.
GENESIS AND CLASSIFICATIONS OF AGATES AND JASPERS:
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.
BANDED AGATES A GENETIC APPROACH:
This book highlights the complexity of the formation of banded agates and the wide variety of different banding systems. A model for the genesis of banded agates is proposed explaining the basic concentric banding and all the variation as horizontal and convolute banding. Chemical processes at the base of Chalcedony deposition are described with simple words and associated to the structures commonly found in natural collectable stones. The book includes many different diagrams showing the formation of the most important structures found in banded agates, as connective channels and stalactites. The interaction with microbial fauna has been proposed for explain a wide group of agate and many characteristic structures.
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 can have your copies
signed by the author
for free. Just ask.
More info at AGATESANDJASPERS(dot)COM
!!!!!!!!!!!!!!!!!IMPORTANT!!!!!!!!!!!!!!!!
The books will be shipped without tracking because of high cost of fast shipping with tracking.  Only for one book the 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.