Characteristics of Channel-Water in Blue-Green Beryl and Its Influence on Colour

This study reports the characteristics of water in channels of blue-green beryl and its effect on color. An industrial camera was used to measure color in the CIELAB color space. X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared spectroscopy (IR), ultraviolet-visible (UV-vis) spectroscopy, and silicate rock chemical analysis method were used for analysis. The peaks at 5105 cm(-1) and 5269 cm(-1) were the combination tone of type II water, which were negatively correlated with b*, and positively correlated with the peak area at 3162 cm(-1) (Na-H) and cell parameter a(0). The peaks at 7097 cm(-1) and 7142 cm(-1) were related to the metal ions types in the channels. Part of the water in the channel combined with Fe3+ to form [Fe-2(OH)(4)](2+) and cause a yellow tone, and when the yellow tone combined with the blue tone caused by Fe2+, the beryl has a blue-green colour.

Automated summary

This study investigates the characteristics of water in channels of blue-green beryl and its impact on color. Through various analytical methods, it is found that the water molecules are correlated with the types of metal ions and related peak values, thus affecting the coloration of beryl.