Barium peroxide: oxidizer. A precursor for hydrogen peroxide. Mixed with magnesium powder and lit with a magnesium ribbon it will ignite thermite (mix 1.7 g barium peroxide with 0.2 g magnesium powder).
Thermite: 76.3% iron II oxide (black), 27.3% aluminum powder. Note that Iron III oxide also works, though
To make the military version Thermate create a mixture of 68.7% thermite, 29.0% barium nitrate, sulfur 2.0%, and dextrin 0.3%.