Links

Member of the Gemmological Association of Australia - http://www.gem.org.au

Member of the Mintabie Miners Progress Association - http://www.mintabieopalfield.com

References

"Opal in South Australia", Mines & Energy Resources, SA - http://en.wikipedia.org/wiki/Opal

Klein, Cornelius and Hurlbut, Cornelius S, 1985, Manual of Minerology, 20th ed, iSGN 0-471-80580-7