Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report. On the basis of micro-observation, it is theorized that a radioactive solution was the probable cause of the pink color. The presence of the pink zones also supplied visual evidence that the host tourmalines had not been heat treated.
Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report. On the basis of micro-observation, it is theorized that a radioactive solution was the probable cause of the pink color. The presence of the pink zones also supplied visual evidence that the host tourmalines had not been heat treated.