"The Birth of Opal" is the only book in the English speaking world that is devoted entirely to the topic of opal formation. It is a detailed investigative and enlightening account of the formation of opal both in nature and in the Lab.The investigation includes; the opal environment, Geography, Geology, Geochemistry, the decay cycle, soil reactions, the effect of salts and chemical reactions that result in "The Birth of Opal".Outside of Russia, "The...