Trying to make homemade lava

So after successfully melting aluminium and copper, I thought I would try to melt some rocks to make home made lava, although I expected glass of some type.

I got the furnace nice and hot, I had to get a new hair dryer to power it as the old one exploded and it was working great and only cost $19.

So unfortunately I couldn't get it hot enough to melt the rocks, just to get them glowing bright red, so will try with sand next week time, but it was fun.