Bulletin of the National Speleological Society - ISSN 0146-9517
Number 18: 50-51 - December 1956

A publication of the National Speleological Society

"After-Glow" of Cave Calcite
Brian J. O'Brien

Abstract

Photographers of cave formations swear by it, others who visit caves may have detected it. The manifestation is "after-glow", here examined by the author in a short treatment. While pure calcite does not emit after-glow, impurities present in cave calcite may well cause a red or blue light emission after a light is extinguished. Reports of after-glow have appeared in the News on several occasions and in various grotto publications.

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