- Opal (Hydrated Silica Glass)
Offers detailed physical description, images of specimens, and more.
mineral.galleries.com/minerals/mineralo/opal/opal.htm
- Gemstones: Opal
An essay from the U.S. Geological Survey.
minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/opal.html
- Opal Festival
Features a parade, mine safety demonstrations, competitions, heritage celebrations, and heaps of opals. Held annually at Coober Pedy, Australia.
www.opalfestival.com
- Gemstone Education: Opal
History of the stone that has a rainbow locked within.
www.cwjewelers.com/stoneopal.htm
- Australian Opals & Outback Australia
Opal mining, opal photos, and the Opal Festival at Yowah.
www.futureweb.com.au/ausopals
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