Nothing found in my system is available to buy in the markets
The system I chose for colonisation is rich in many metals and minerals including tritium, alexandrite, bromellite and void opals which each have a hotspot in a pristine ice ring. The planets and moons also have ample supplies of iron, nickel, phosphorous and more.
I have two mining settlements, a mining facility above the icy rings, and both a refinery and an extraction hub.
Unless this is something to change with the next server tick though, NONE of these minerals and metals are available for sale in any of the markets in the system. Instead, what's for sale doesn't reflect the system at all.
The commodities for sale in a system should reflect what's found in that system as, for a mining colony, this is exactly why I chose this system in the first place. If the system doesn't sell the stuff found in it, then frankly we're all just wasting our time.