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Robert Colburn’s main modelof geode/thunderegg formation based on his lifetime study and mining of geodes.Colburn, being dyslexic, the editor teamed up to fully review and edit his CDdraft book and notes, and update it. The original CD book is in poor editorialcondition due to his dyslexia. The editor and publisher is a geologist, whohelped him with the text. This took place while Colburn was still alive, takingtwo years. Colburn is now deceased and in keeping with his wishes, updates areedits of errors, and when the editor has specific infrared spectroscopyinformation to identify structures speculated about, that is noted. The contentis unchanged. This book is digital laser printed, full color, 8.5 x 11 in size,plastic comb bound. 272 pgs. Last updated 4-2021. Keywords: geodes, thundereggs,amygdules, lithophysae.
