While mining can be fun for many, I think another list to consider is things non-gem like to be found in the ground. to include gravels, metals, liquids and so on.
Now… you can go the fun route and if you are more a chemist you could create these metals, assuming we have a Science class that prefers chemical compounds.
Aluminium can be made with Bauxite, and Kaolinite.
Iron from Haematite, Magnetite, Siderite, and Iron Pyrites.
Copper from Copper Pyrites, Malachite, Cuprite and Copper Glance.
And Zinc from Zinc blend/Sphalerite, Calamine, Zincite.
[as an example]
Some other things we could find:
Lead … and so many more…
Now-- I don’t know if we want to necessarilly bring in real-world chemical compounds but finding these and then changing how they are used could be something. But when thinking of these races, this could be something that other classes cannot do naturally to start. Maybe as a base the Science class or similar could have a natural bonus to dealing with raw minerals and have a lower chance of losing out on profit. Long term this wouldn’t have too much effect on PVP or fighitng, outside of being Gemologists and Metalologists.
I can 100% see these being your Chemists of the game, and helping with brews, fuels for ships, or transportation, and advanced weaponry. Providing precious and expensive/rare gems to those who need them in their tools/armors for better casting of magics/spells/abilities.They could pay one of the other races that might get better ‘drop’ ratios for being more brute to go do the mining, bring back the loot/finds for refining numbers, and then the spell casters can cast a bigger/more impactful spell in combat with the gems.
Anywhoo, Enough theory for one post. More lists!
Natural gas Liquids:
St. Elmo’s fire
Other States of Matter:
Liquid crystals: A liquid crystal is intermediate between a liquid and solid.
Superfluid: A superfluid is like a liquid, but with zero viscosity.
Bose-Einstein condensate: Bose-Einstein condensate is like a super-cold gas in which particles stop behaving independently of each other.
Color-glass condensate: Color-glass condensate is a type of matter predicted to be found in atomic nuclei moving a near-light speed.
Dark matter: Dark matter is a type of matter than neither absorbs nor emits light.
Liquids that change based on temp:
Solids may melt into liquids
Solids may sublimate into gases (sublimation)
Liquids may vaporize into gases
Liquids may freeze into solids
Gases may condense into liquids
Gases may deposit into solids (deposition)
More on the above:
Changes in temperature and pressure cause matter to transition from one form to another. The most common phase transitions are:
Freezing: Freezing is the transition from a liquid to a solid.
Deposition: Deposition is the transition from a gas directly to a solid.
Melting: Melting occurs when a solid changes into a liquid.
Condensation: Condensation is when a gas transitions into a liquid.
Sublimation: Sublimation is the change from a solid into a gas:
Vaporization: Vaporization is the transition from a liquid into a gas.
Recombination: Recombination or deionization is the change from a plasma into a gas.
Ionization: Ionization is the phase change from a gas into plasma.