100% Genuine shungite sourced from Zazhoginsky mine in Kerelia region of Russia. The plate has one side polished so will not mark or stain clothing. The bottom side has strong self adhesive which can be attached to the phone underneath its case or to the phone case itself.
Shungite is a rare type of diamagnetic material which has the ability to attenuate electric fields and radio frequency.
The material has gold coloured streaks, these are not cracks but natural deposits of pyrite which is typical in good quality shungite.