arble is slightly different. Like iron mines, marble quarries must be adjacent to a rock out-cropping. Unlike all other raw materials, though, marble does not go to a workshop. Its main use is in the construction of oracles and large temples: you cannot build these structures unless you have marble in your warehouses.

That doesn't mean that marble is useless apart from these buildings. Although it cannot be processed into anything else, architectural-grade marble is a valuable commodity. Few provinces can quarry marble, and it is widely demanded throughout the Empire. If your city is lucky enough to be able to extract marble from the rocks, you probably have an easy source of high-export income.