Slovak Opal – A Rediscovery of the „Queen of Gems“

Contents

Chapter  / Page

                   Acknowledgements / 7                                                                              

                    Preface / 9

               Introduction / 10                                                                                                           

1. Slovakia: The Opal’s Birthplace / 14

·         Slovakia: the opal’s birthplace                           

·         An Historical enigma                          

2. Finding your way to opal’s birthplace / 25      

·         A geographical and historical itinerary on the opal trails 

·         Opal trail # 1

·          To know more… The possible amber route/opal route connection

·         Opal trail # 2  

3.   Finding your way to opal’s birthplace / 43

·          A geographical and historical itinerary on the opal trails : an interesting detour Evidences

·         To know more… Getting acquainted with Roman coinage

·         To know more… Kings, Queens and coins  

4. Finding your way to opal’s birthplace / 55

·         A geographical and historical itinerary on the opal trails . getting into opal country Zlatá Baňa, Červenica

·         To know more… Working conditions at the opal mine

·         To know more… The Goldschmiedts’ saga

5. Finding your way to opal’s birthplace / 75

·         A geographical and historical itinerary on the opal trails…

·         The mine location

·         The miners’quarters

·         The old opal cutting plant

·         Linking past and future

·         Finally at the mine!

6. Visiting the old Dubník mine / 91

·         Today’s mine extraction

·         The old mine workings

·         To know more… The Dubník bats’ natural reserve

·         Today’s trading of opal at the mine

·         Inside the old mine

                  ·         Inside the old mine: more recent minerals

7. Geological map of Zlatá Baňa region / 123

·         Zlatá Baňa stratovolcano: the cradle of the Dubník opal

·         Stratovolcano minerals

·         The geological structure of the opal deposits environment

·         Opal bearing structures

                  ·         The succession of minerals

8. Description of deposit and opal formation / 135

·         The andesite host rock

·         Opal genesis

·         Notes

9. Technical Data / 165                                           

·         Gemmological properties of the slovak opal

·         To know more… How to take care of your opal

·         Calcination test

·         X ray diffraction test

·         Infra-Red spectrophotometric analysis

10. What causes colours in opal / 181

·         The optical phenomenon called play of colour

11. Classification of slovak opal / 185

·         Varieties and trade names

·          To know more… The initiators of the opal classification system

·          To know more… General classification of opal

12. Quality grading of opal / 199

·         General criteria

13. Modern opal cutting in Dubník / 205

·         How opals are cut

·          To know more… Modern opal cutting in Dubník

14. Modern opal jewellery / 215

·         Production in Slovakia

15. Historical notes on… / 221

·         Famous slovak opals

16. Historical notes on… / 220

·         History of the mine

·         Written documentation

17. Historical notes on… / 232

·         Opal in literature, myth and legend

18. Technical glossary of … / 243

·         Mining terms

·         Geological terms

·         Mineralogical terms

·         Gemmological terms used in chapters 6,7,8,9,10,11,12

        Bibliography / 264

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