I found a few of these in the mines and noticed that the picture here is accurate - but the item type seems to be inaccuratly listed as combinable. I looked in EQTraders and it says:
Item Info
Dark Ore
WT: 20.0 Size: MEDIUM
Class: ALL
Race: ALL
This item is not used in any recipes.
It may have been intended for DoN armor but if it ever was it isn't anymore.
I think its vendor bait
Nalot the Rogue