To start the topic up again, what do you guys think is the main composition of the bedrock on Athas? Sandstone has probably formed in many places, due to pressure in the Silt Sea. But I’m talking about the original bed rock before the calamities. Are we dealing with granite? I doubt it. I would think Basalt would be the most likely, which is a pretty hard rock too though, but rather easy to break.
I ask because as you know from my other post, my players may be going to a limited Underdark area, (more of a large cavern under the silt sea that may have connecting tunnels dug by the residents.) and if at any time they will need to mine rock, I would like to know what kind of rock I will be dealing with.