block breaking animation:
a small mark from a pick/fist, with cracks branching off and slightly getting deeper/wider over time
furnaice:
a large slot in orange stone, with a pot on logs in it
the lit furnace should have the slot illuminated, with burning logs visible, and the pot giving off the closest thing possible in pixelation to a reflection
chests:
the stereotypical wooden chests with gold/metal trims