Geodes: Nature's Treasures
by Brad L. Cross and June Culp Zeitner
Geodes: Nature's Treasures
|
|
| 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 |
207
|
| 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
|
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