How is Opal Formed? - the Geology of Opal
FAQ : How is opal formed? / How are opals formed? What is the Great Artesian Basin? What is potch? What causes the formation of opal?
Read more...Learn About Opals - Advanced Topics
Opal Cutting & Polishing- How to Cut and Polish Opal
FAQ: How is opal cutting done? How do I cut rough opal? Where can I learn about cutting opals? How is opal polishing done? How can I polish an opal?
Read more...Where do Opals get their Colour?
FAQ: What causes the colours in opal? How does opal get its color? What is potch? Where do opals get their colors? What is the structure of opals? Why does opal have colour?
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Black Opal Vs Boulder Opal
FAQ: Which is better, black opal or boulder opal? What is black opal? What is boulder opal? What is the difference between black opal and boulder opal? How are black opals valued? How are boulder opals valued?
Read more...Opal Nomenclature & Classification
A new era for opal nomenclature
Anthony Smallwood FGAA, GG
Chairman, G.A.A. Opal Nomenclature Sub-committee
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Opal Resources for Download
The following outside resources are available for download in PDF format and require Adobe Reader.
To download a file, please right-click on the link and select 'Save Target As'.
Read more...Opal Fossils
FAQ : What are opal fossils? Where are black opal fossils found? What does opalized / opalised mean?
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