Death in the Depths "Mount Gunbad quest"

[fixfax86]

Hello, I can't get the Brightstone Chunk from the Brightstone Deposit at the start of right wing in Mount Gunbad, needed for completing the quest "Death in the Depths"! is it a Bug, do I need a tool to get the " Chunk from the Deposit, or do I get the Brightstone Chunk elsewhere?