Mineral Stone is Resynths ore block. By default, it only spawns between levels 3-5 and in rare amounts. However, this can be changed in the mods config settings.

When broken, Mineral Stone will usually drop 1 to 2 Mineral Rocks which are needed throughout the mod to get started and progress. A fortune pickaxe can increase the the amount of Mineral Rocks dropped. Occasionally, the Mineral Stone block will drop Mineral Seeds instead of Mineral Rocks. These seeds can then be used to grow Mineral Rocks instead of mining it.

In 1.13.2, Mineral Stone world generation changed slightly. Mineral Stone now spawns higher up and in larger amounts.