Hepatizon Ore?

So got all my mog garden stuff at rank 7. And have Ysstog (whatever his name is ) employed as a helper.

According to wikis this ore can be obtained from mineral vein. But none of the wikis list this ore in the table of items. So is it classed as a precious metal or normal metal? Which serum is best to use? I been using the Auserum for precious metals and it's not dropping from that at all. And I'm assuming vein #4?

just use rock oil on upper #4 at all times it is rare but ive gotten about 100 hepatizon ore this year from that.