Updated of a very old pic and some idea names would be

Kolinum is a Soft, Very Heavy and Very Common even more the Iron and Gold in them, until it is refine and forged in Alloy making It Extreme Hard, Lightweight and very useful for most if not all forms of armor. Note for Vehicles the Alloy need to be heavy reinforced and given extra weight for improve defense

Axhtral is a bizarre light gemstone that can also be used as a type of battery do to its charge and highly reactive materials. Not only being a beautiful gemstone when refined or over type but is also a very natural battery

Plauarts or more commonly called Elemental Crystals are a type of Plant-like Material that can grow natural all over the dragon homeworld, At first they may not seem to have much use, they are there and dont cause much harm to the environment but Dragons soon learn about its other skills, As being Plant-Like there seem to have the ability to adapt or gain something from the environment they grow in like if a crystal was by fire or magma it will change color and can make heat as well its another form or a natural battery to special part for Elemental Weapons

The big negative with Elemental Crystals is that is takes time to grow and purifier to the elemental environment, meaning change can effect it and it cant be taken too early or it will just be another gemstone with charger.
Dragon soon made special farms for them and made a weaker but more easy made Artificial Form of it from broken or left over piece of past ones, it can also be refined as well to improve its use in battery and being an upgrade as a special part though refine it is never easy and it can be expensive