This mod adds three new ores, along with craftable tools and armor. The ores all spawn in the exact identical way, and all of the tools have the exact same dig times and properties. The armors have some different values, but it is unsure how the materials fit into the Minetest Game tech tree which already is unbalanced and contains redundant tiers.
Admittedly there are some slightly unique properties, like the Multi Boots that give you a speed boost, or Multitool which is a pickaxe that can break all types of nodes in the same time as the other tools. But in general it is more or less randomly coloured ores with little to no use. Fun to test Calinou's law, maybe not much else.