I’ve heard it mentioned from geologists how lucky we are that geological processes, such as volcanism and plate tectonics, give us access to ores that we extract and use everyday (ie gold and copper) which would otherwise be too submerged or lack abundance. On the contrary however, are there any minerals that we’re aware of that could have had major industrial implications on society but are too inaccessible for mass production? What are they and what could they have been used for?