It is impossible to process yellorite in a Mekanism setup, as well as cinnabar and some others. Perhaps make a small patch for this?
Possibly, but the MPT won't do it if you are asing for the shards, slurry 'cause it's too much work, but for "pulverizing" maybe ._.
Actually, there's a mod that adds cross-mod ore processing compatibility installed on the server. Perhaps they could implement that?
There needs to be recipes for diamonds, emeralds, redstone, and yellorite... I'm pretty sure the mod we have "Another One Bites The Dust (AOBD)" allows that easily through the config.
