The gleaming powder in Minecraft is a substance that can be used to make items that will make you glow. You can craft this substance using a recipe that uses guano. The resulting product will be a variety of things that will enhance your Minecraft experience. This substance has minimal documentation, and it can be added to your existing world. However, this substance requires you to have the Fabric Modloader and Curios API installed in your game in order to use it.