Editing Opal (section)

==External links==
{{Commons category|Opal}}
{{Wiktionary|opal}}
{{Wikisource|1911 Encyclopædia Britannica/Opal}}
* [http://www.farlang.com/gemstones/opal Farlang opal Hist. References] Localities, anecdotes by [[Theophrastus]], [[Isaac Newton]], [[Georg Agricola]] etc.
* [http://gemstone.org/gem-by-gem/english/opal.html ICA's Opal Page]: International Colored Stone Association
* [http://www.samuseum.sa.gov.au/explore/museum-galleries/opal-fossils Opal Fossils from the South Australian Museum] {{Webarchive|url=https://web.archive.org/web/20140213204022/http://www.samuseum.sa.gov.au/explore/museum-galleries/opal-fossils |date=13 February 2014 }} Accessed 19 October 2016.
* [http://webmineral.com/data/Opal.shtml Opal Mineral data and specimen images] Mineralogy Database
* [https://www.opalworld.com.au/australian-opal-fields/ Opalworld] Australian Opal Fields – Map of precious opal deposits

{{Silica minerals}}
{{Gemstones}}
{{Jewellery}}
{{Glass production techniques}}
{{Authority control}}

[[Category:Opals| ]]
[[Category:Emblems of South Australia]]
[[Category:Glass in nature]]
[[Category:Hydrates]]
[[Category:National symbols of Australia]]
[[Category:Silica polymorphs]]
[[Category:Symbols of New South Wales]]