So, in Spectrum, it uses gem shards (Minecraft Amethyst and from Spectrum from Onyx, Topaz, Citrine) and their corresponding powder. For all * except * Amethyst, you can put the gemstone shard into the Create millstone and, correspondingly, the Create millstone upgrade, the Create grinding wheels, to get 2, with a chance for 3, powder. Everyone of them work in the Create millstone but the Amethyst one is missing from the Create grinding wheels. Amethyst only give Hex Casting amethyst stuff but not Spectrum. Like when breaking an Amethyst cluster the Create grinding wheels should give both.