AGATESANDJASPERS.COM

The new book
Banded Agates
a genetic approach
by
Marco Campos-Venuti (2018)

in English
200 pages, +400 pictures,  +40 diagrams


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YOU WILL FIND IN IT SIMPLE EXPLANATIONS OF:
The formation of different type of banding:
Concentric Banding
Horizontal Banding
Convolute Banding
Fortification Agates
The formation and evolution of different kind of  Connective Channels
Dilution and dissolution effects
Moss Agates
Bacterial influence
Si-Polymers: Opal, Jasper and Chalcedony
Disequilibrium processes
Geology of agate deposits
and much more .........
ONLY: 35 USD + 11.50 USD for Worldwide Shipping = 46.50 USD
(+8 usd for Shipping in Europe = 43 USD)
INTERNATIONAL
EUROPE
 
Table of contents of the book
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. He has a PhD in volcanology, has been editor of the Rivista Gemmologica Italiana for 7 years and is author of numerous scientific publications. 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.


The book
Genesis and Classification of Agates
and Jaspers: a New Theory
by
Marco Campos-Venuti (2012)

in English
160 pages, 437 pictures,  22 diagrams

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ONLY: 35 USD + 10 USD for Worldwide shipping = 45 USD

(+7 usd for Shipping in Europe = 42 USD)
INTERNATIONAL
EUROPE
Table of contents of the book
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.



SPECIAL OFFER for the 2 books:


= 50 usd +16 usd shipping = 66 usd
(instead than 35+35+16=86)

WORLDWIDE

Contact:  marcocamposvenuti@hotmail.com

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.
The theory has been presented at:
CIGES 2012 (Convegno Italiano Gemmologia Scientifica) in Florence, Italy
25-September-2012    "Una nuova teoria sulla genesi dei diaspri e dei calcedoni"
(in italian with english slides)
http://www.gemmologiascientifica.uniba.it/programma.php

IGE (Instituto Gemológico españolo) in Madrid, Spain
16-October-2012    "Jaspes y ágatas, polímeros de la sílice" (in spanish)
http://www.goldandtime.org//instituto/gemologico/espanol/desvela/este/martes/misterios/jaspes/agatas/polimeros/silice/52329/
The talk (in spanish) can be viewed at:
http://www.youtube.com/watch?v=0t4oHunRjCI&feature=plcp

G.A.M. Sevilla, Spain
22-Juin-2013    "Jaspe, polímero de la sílice: Origen y Clasificación" (in spanish)
28-December-2013    “Agatas: concreciones de Calcedonia” (in spanish)

Tucson Mineral Lecture Series 2015 at Pueblo Gem and Mineral Show, Tucson, Arizona
9-February-2015    "Agates, Jaspers, Opals: Polymers between Crystals" (in english)
(For the audio recording contact www.bluecapproductions.com)
http://ganoksin.com/blog/tucsongemshow/2015/02/10/tucsongemshow-2015-mineral-lectures-first-night-sro/

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Review by Mark Oros at: http://www.thisviewoflife.com/index.php/magazine/book_review/genesis-and-classification-of-agates-and-jaspers-a-new-theory1

Review by Bob Jones in Rock & Gem, February 2013

Review by Tony Nikischer in Mineral News, March 2013

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You can learn here about the new classification of jaspers in 4 types:
Classification of Jaspers

 
Jasper 1
Jasper 2
Jasper 3
Jasper 4

The author is available for give lectures or course on the subject (in english, spanish, french, italian):
1-3 hours lecture
5-10 hours short course
30 hours complete course
Contact for rates and availability: marcocamposvenuti@hotmail.com
 
COURSE ON: MICROCRYSTALLINE SILICA
hold in microvideos  by Marco Campos-Venuti (in ENGLISH) 

CORSO SU: LA SILICE MICROCRISTALLINA
tenuto in microvideo da Marco Campos-Venuti (in ITALIANO) 

 
SPECIMENS FOR SALE

check my other web about quartz with inclusions:

http://www.quartz-inclusions.com