Morphology and Radiation-induced Centres of Technogenic Gypsum

Gypsum crystals were formed from a saturated solution of produced water remaining in the horizontal section of the discharge pipe and cause undesired (side) man-made phenomenon as clogged pipe. However, for scientific purposes, this fact has become unique and revealed the typical defect centres, and enable us to study the effect of thermal and radiation effects on the crystal structure gypsum. Single crystals of gypsum at room temperature may gradually lose crystallization water. Its absence is compensated by the change of coordination number, calcium, and sulfur, which leads to the formation of point defects, which become paramagnetic during irradiation. It was found that the morphology of single crystals of gypsum corresponds to setting I2/a monoclinic system. The faces of the crystal are allocated on a well-developed cleavage plane (010) perpendicular to the axis b. Face, elongated along the [100] direction, was used to identify the orientation of the crystal in the resonator of electron paramagnetic resonance (EPR) spectrometer. In this paper, parameters of the spin Hamiltonian of paramagnetic centres and their models in a crystal of technogenic gypsum were presented. They are suitable for reliable ESR dating and reconstruction of the environment.