New members are most welcome to attend. Refreshments will be served.

Tuesday at 7:30pm

              Open to the public

Eastern Greenwich Civic Center,

90 Harding Road, Old Greenwich, CT 06870

    ​                        (same location as our fall show)

 The presentation is free and open to the public, and refreshments will be served. We request that children be accompanied by a parent, grandparent, or guardian.

​​​​​Program Nov 12, 2019

Fluorescence, History, Mechanism and Applications by Howard Heitner

     One amazing property of some minerals is their ability to convert invisible ultraviolet light to bright visible light in a wide range of colors. Many museum mineral displays include a fluorescent case. This phenomenon was observed and named almost 2 hundred years ago. The talk will explain how a mineral changes ultraviolet light to visible light. In addition to providing spectacular shows for mineral collectors, fluorescence has many practical applications in medicine, chemical analysis and other fields. Recent advances in LED technology has made small battery powered lights relatively inexpensive. They work well on a number of minerals including calcites, sodalite and fluorite.

The speaker, the outgoing president of the SMS has been collecting fluorescent minerals for over 50 years.