2016 Volume 67 Issue 4 Pages 101-110
Two specimens of fluorescent opal in the Shikaribetsu area, central Hokkaido, were studied on their chemical compositions of fluorescent layers. Some characteristic properties for their chemical compositions were elucidated, although clear relationship between chemical element and fluorescent color was not found out. They contained as much as several hundred ppm of Li, Be, Ga, As, Rb, Cs and several thousand ppm of Sb. Alkali elements (Na, K, Li, Rb, Cs) and alkali earth elements (Ca, Sr, Ba) showed relatively small variations among the parts showing different color fluorescence in one sample. Further study on organic materials is necessary for better understanding of the fluorescence phenomenon.
