If you cant get the thunderstone yet. Throw it in a box and save it for when you do. It'll only give you coal, but its better than wasting items you don't want. I didn't use a box, i dug a pit on my base area and threw everything into it until I got the incinerator, now i load everything in there until it's full and then **Crack!** Thor bestows me with a gift of coal. Just like Santa does every year. :(