Colemanite: Emet Borate deposit, Emet, Kütahya Province, Aegean Region, Turkey.
The bluish to greenish white fluorescence of colemanite is partly intrinsically, partly due to organic substances, mainly humic acids. The Green phosphorescence is also due to these humic acids.
Short wave UV
Long wave UV
Colemanite: Emet Borate deposit, Emet, Kütahya Province, Aegean Region, Turkey.
The bluish to greenish white fluorescence of colemanite is partly intrinsically, partly due to organic substances, mainly humic acids. The Green phosphorescence is also due to these humic acids. The orange-yellow fluorescence is most likely due to a complex of calcium with humic acids (calcium-dihumate)
