This unit includes:
This unit includes:
Triboluminescence is the property of emitting light when struck or rubbed. A well-known example of a triboluminescent material, not mentioned in the booklet for this unit, is WintOGreen Lifesavers; the sugar crystals in these candies triboluminesce mainly in the ultraviolet range, and the wintergreen oil fluoresces in the blue range when excited by the ultraviolet emitted by the sugar.
The booklet mentions that the triboluminescent properties of mica were not well known or understood at the time, and this still appears to be true. Most mica does not exhibit triboluminescence, so the phlogopite specimen in this unit is quite unusual in doing so.
Production by Ruby Yoshioka.