The Hutchison effect can levitate any material and melt different types of material together as well as other strange effects. It is named after John Hutchison who doesn’t understand and cannot reliably replicate his results(but unreliably he can). With only 75 Watts of power he produces these effects. Intersecting fields between 2 or 3 Tesla coils is the key to this effect, but it might require other fields as well. It only works at specific frequencies. You can find out more in this video and at Wikipedia.