Dinara is the crystal worker for Perikalia. She had a crystal mine just south of Kratoa-Kel, but it has been infested by shades. A common affliction, alas, when dealing with high concentrations of natural magic.
Dinara will reward you if you can travel to her mine and rid it of shades.
The mine is in the North Storm Plains. The locked door here opens with the key given by Dinara when you get the quest.