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Geodes: Nature's Treasures

Geodes: Nature's Treasures

by Brad L. Cross and June Culp Zeitner

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What are geodes? How do they form? Where can they be found? How to open them and collect them. Heavily illustrated with beautiful specimens. This book is a 7" x 9" paperback with 292 pages.

Geodes: Nature's Treasures
Table of Contents

Foreword
vii
Acknowledgements
ix
Introduction
xi
About the Authors
xii
      PART I: Gifts from Ancient Volcanoes
1
Chapter 1: What are Geodes?
3
Chapter 2: The Mysterious Formation of Geodes in Igneous Rocks
5
Chapter 3: Inedible Coconuts: Mexican Coconut Geodes
11
    Mineralogy 16 - How Are "Coconuts" Formed? 26 - Mining Operations 30 - Opening "Coconuts" 39
Chapter 4: When Geodes are Gems
43
    Brazilian Amethyst Geodes 43 - Mineralogy 48 - Mining 49 - Opening Brazilian Geodes 53 - Heat Treatment 53 - Flowers 57 - Valuing 58 - Uruguayan Amethyst Geodes 58 - Mining 58 - "Stalactites" and "Bulbs" 59
Chapter 5: More Latin Surprises
61
    Tabasco Geodes 61 - Trancas Geodes 63 - San Marcos Geodes 68 - The Geodes of Salto do Jacui 71 - Ocos 74
Chapter 6: Geode Curiosities
77
    Polyhedroids 77 - Enhydros 79
      PART II: Gifts from Prehistoric Seas
83
Chapter 7: From Sediments to Glamour
85
    Some Definitions 87 - Theories of Origin 91 - Variations 92
Chapter 8: Wonderful Warsaw
95
    Physical Characteristics and Inclusions 95 - Origins and Locations 98 - Types of Sedimentary Geodes 104 - Illinois Geodes 105 - Missouri Geodes 106 - Quartz in Geodes 108 - Calcite in Geodes 109 - Beautiful Common Inclusions 111 - Keokuk's Northern Cousins 116 - How to Find and Enjoy Geodes 117 - Opening, Preparing, and Showing Sedimentary Geodes 119 - My Thoughts About Midwest Geodes 121
Chapter 9: Strange Geodes of Indiana
123
    Recognizing Geodized Fossils 134
Chapter 10: A Few Bonuses
137
    Silicified Anhydrite's Fossil Family 140 - Tennessee 144
Chapter 11: Amethyst Surprises and Baby Rattle Rocks
151
    Lapidary Treatment 156 - Baby Rattle Rocks 159
Chapter 12: Florida's Ocean Harvest
167
    Florida's Ample Bonuses 181
Chapter 13: Not Always Quartz
185
    South Dakota Barite 188 - From Celestite to Iron 190
Chapter 14: Strange, Stranger, Strangest
197
    Bitumen 201 - Poison 204
      PART III: Thundereggs and More
205
Chapter 15: Dozens of Eggs
205
    United States 212
        Oregon 212 - Idaho 217 - California 218 - Utah 218 - Nevada 221 - Arizona 221 - New Mexico 222 - Colorado 223 - Alaska 224
    Mexico 225
        "Galaxy Geodes" 225 - "Ocotillo Geodes" 225 - "Palomas Geodes" 229 - "Red Skin or New Chalce Geodes" 230 - "San Juan Geodes" 230 - "Tamaka Geodes" 230 - "Zacatecas Geodes" 231 - Blue Chalcedony 231
    Canada 232
        British Columbia 232
    Opening Thundereggs 233
Chapter 16: Almost Geodes: Concretions and Septarians
235
    Ammolite: Canada's Fossil Gem 237 - More Concretions 239 - Utah's Gem Concretions 240 - Illinois' Fossil Concretions 240 - Utah's Septarian Nodules 243 - South Dakota's Septaria 246 - Concretions of Oklahoma 249 - Other Septaria 249
   
    Summary
253
    Geologic Time Scale
254
    Frequently Asked Questions About Geodes
255
    Bibliography
261
    Glossary
273
    Index
281