Fabric Furnaces is my take on the furnace version of the popular mod Iron Chests. It adds in new furnaces based on vanilla materials that scale in speed & ability. Fabric Furnaces is made for Fabric; it requires the Fabric Loader & Fabric API.
To craft Crystal variants of the furnaces, surround them with 8 glass.
To report an issue, please go to the GitHub issue tracker here. To view documentation on furnace stats, view the wiki here.