. Book Bundle: Marco Campos Venuti | The Gem Shop, Inc.

Book Bundle: Marco Campos Venuti


Save 15% on both books by Marco Campos Venuti!

Genesis and Classification of Agates and Jaspers: A New Theory

"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."

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 convoluted banding. Chemical processes at the base of Chalcedony deposition are described with simple words and associated to the structures commonly found in natural collectible 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."