EIGHTH ANNUAL SINKANKAS SYMPOSIUM — Gem Feldspars
Named for one of the most distinguished and influential figures in gemology and mineralogy, The Sinkankas Symposium is an annual one-day event featuring presentations by noted specialists working in diverse gem-related disciplines or occupations. The theme of the Eighth Annual Sinkankas Symposium was Gem Feldspars.
The Sinkankas Symposium has been described as the most important gemological conference in North America by respected authorities on gemstones. Organized by Roger Merk, the annual event is co-sponsored by the San Diego Mineral & Gem Society and GIA (Gemological Institute of America), which has provided the Sinkankas Symposium venue for the past eight years. Bill Larson has been a generous supporter and lively speaker at the event since its inception.
Sinkankas Symposium — Gem Feldspars
The 2010 Sinkankas Symposium on Gem Feldspars was held on April 17, 2010, at the Gemological Institute of America (GIA), Carlsbad, California. Ten speakers presented eleven lectures to an audience of 150 attendees. Highlights from the program included recent gemological and analytical research on Chinese andesine presented by Shane McClure, Director of the West Coast Identification Services at GIA laboratory in Carlsbad, CA, and Dr. George Rossman, Professor of Mineralogy in the Division of Geology and Planetary Sciences at the California Institute of Technology, Pasadena, CA.
Selected papers prepared for the symposium and articles on Gem Feldspars are available for purchase. For more information about the papers/To place an order »
Eighth Annual Sinkankas Symposium on Gem Feldspars — Program
Recognized specialists in fields ranging from mineralogy and crystallography to history, treatment, cutting, collecting and selling made presentations on Gem Feldspars, including moonstone, sunstone, labradorite, peristerite and amazonite. Recent gemological and analytical research on Chinese andesine was also presented.
Speakers and Topics
- Meg Berry – Tricks to Cutting Gem Feldspars
- Rock Currier – Amazonite Specimen Production in Colorado and Ethiopia
- Si Frazier – Spectacular Spectrolite
- John Koivula – The MicroWorld of Gem Feldspars
- Bill Larson – World Class Collectable Gem Feldspars
- Shane McClure – Problem of Copper-Diffused "Chinese" Andesine-Labradorite
- Dr. George Rossman – Natural and Lab-Induced Color in Feldspars
- Dr. George Rossman – Chinese Red Andesine
- Dr. Skip Simmons – Madagascar Gem "Orthoclase" and Crystallography of Gem Feldspars
- Lisbet Thoresen and Dr. James A. Harrell – Archaeogeomology of Amazonite
- Bob Weldon, Keynote Speaker – The Many Faces of Feldspar
Remarkable, outstanding, exceptional—Bill Larson had an extraordinary orthoclase specimen on view at the 2009 Westward Look Show in Tucson. Dave Wilber brings us on a personalized tour of some highlights in Bill Larson's collection, including a large (we mean really big) transparent yellow orthoclase crystal from Madagascar. Clip courtesy BlueCap Productions.
2014 — Peridot
The theme for the Twelfth Annual Sinkankas Symposium was Peridot & Uncommon Green Gem Minerals and was held on Saturday, April 5, 2014, at GIA world headquarters in Carlsbad, CA. The one-day event featured 11 presentations made by nine speakers, with 148 attendees traveling from as far away as Italy and Australia. Join the mailing list »
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TUCSON, AZ 2017
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January 28 – February 11
- AZ Mineral & Fossil Show (Fall)
Denver January 30 – February 13
- Westward Look Show
Tucson February 3–6
- 63rd Annual Tucson Gem and Mineral Show
(the main show) February 9–12
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Gem & Mineral News
Andesine – Red-Hot Topic
Andesine, the saga continues…
Shane McClure (GIA) and Dr. George Rossman (Caltech) present recent gemological and analytical research at the Sinkankas Symposium on Gem Feldspars —2010
Gem News from Pala International: A Mystery of the Orient
Red Feldspar – A Puzzle to Fix
Sunstone Hunting in Tibet
Diffusion Treatment of Andesine
Sunstone Controvery: The Furor Over Feldspar