The Nether Furnace was a idea i've suggested, using 8 nether bricks (not the items) and a nether quartz as the crafting recipe. It works like the regular furnace except it is powered by hooking it up with redstone. When used in the overworld the time when smelting items will take 3x longer but remains unchanged if used in the nether.
I like the idea, but I don't think that it should have to take 3 times the amount of time in the overworld, why would I want to use it? Maybe because it doesn't waste my coal or wood, but still, i think it should only be at most x1.5, honestly, I think it should be the same. Because by this point, you have diamond tools and have mined obsidian, I think it should be the same. But overall, I think the idea of a nether furnace. You have my support.
The nether quartz used in crafting was supposed to provide a power input for advanced redstone devices like the nether furnace. The reason why it is used for the nether furnace because it uses redstone as power output to power it and that's how nether quartz was used, it uses redstone not other fuel sources to smelt items.
If you hooked it up with red stone, the it would effectively never use any fuel, ever, and why the hell would you use quartz in a furnace, what kind of logic is that. Don't use items in crafting recipes unrealistically.
It's plain daft.
Nether quartz is based off of Germanium. which is a nuclear chemical element. it makes perfect sense.
You have my support. +1