Put all of a item's "class types" in the tooltip.

[aikidragon]

Main concern is a tooltip bloat.

Obvious solution: add some sensible way to toggle simple/extended item tooltips.

Extended tooltip toggling sounds nice.

Another thing that sounds nice, even though it's a different suggestion, is an ingame item glossary that also mentions the class types.

[XBBW]

Yea this would help with stone vs ore or items that are both stone and ore.