From memory:
- Silver, gold (you can build mines on these and no others)
- Camels, Elephants, Dogs, Pigs (think these can only be used for unit training)
- Slaves (Only appears when you invade a province, runs out after a while)
"Proper" trade resources:
- Amber
- Marble
- Tin
- Iron
- Copper
- Lead
- Grain
- Timber
- Pottery
- Textiles
- Wine
- Olive Oil
- Hides
- Incense
- Silk
- Glass
- Purple dye
- Wild animals
I admit to not being sure that we have the means to change the map icons, so we'll need to be smart about any major renaming that goes on.
Preliminary thoughts: glass looks like a beaker, could be chemicals? Books should definitely be a possible resource. Not sure what else...