Post subject: Andesine Discussion in Tucson: ALL STAR CAST!
Posted: Tue Jan 24, 2012 10:13 pm
Joined: Sun Oct 16, 2005 12:22 pm Posts: 17655 Location: San Francisco
Andesine & Labradorite from Tibet, Inner Mongolia, Mexico & Oregon: A Tucson Panel Discussion
Moderator: Dana Schorr Panelists: Richard Hughes, Ahmadjan Abduriyim, George Rossman, Adolf Peretti with Shane McClure & John Emmett
The mining of natural red and green andesine in Tibet and near-colorless andesine in Inner Mongolia has been a subject of controversy. Large quantities of diffusion-treated andesine from Inner Mongolia entered the world markets without proper disclosure starting about 2000; however the idea that there might also be a source of natural red andesine in Tibet has been met with extreme skepticism from some quarters. This has not only polarized the gemological community, but has also created a lack of confidence in natural Oregon sunstone.
This program will present the latest results from field visits to both Tibet and Inner Mongolia, along with advanced testing of stones from each of those deposits. Simple tests will be described to separate both Tibetan and Inner Mongolian andesines from Oregon sunstones. The purpose is to finally put to rest the controversy surrounding these stones.
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