I saw no way to do this, and I was looking at recipes, found that I was short on blue shards, which are apparently made of moonstone. I have a bunch of moonstone, which I collected as an attempt to get more blue shards, before I realised crystals don't equal shards...
It be good to be able to split crystals down into shards of it. So maybe break one big crystal thing, down into four or five shards. This can give players decisions between dumping crystals into the core for power or using them to create things.
Ask people on Haven and buy the materials from them. I have about 900 blue shards, they are worthless.