Monomolecular explosives

Probably the most rare combination is the mixture of AN prills with a solid fuel. To get a good reaction between a fuel and an oxidizer an intimate mixture is needed. This is why monomolecular explosives (with fuel and oxidizer on the same molecule) tend to have higher detonation velocities than composite explosives (where fuel and oxidizer are two separate components). This is also why grain dust explosions occur yet, a pile of wheat is not easy to light on fire. Mixing any solid fuel with prills of AN (which are inch in diameter) will obviously not produce a very good mixture of reactive components. 

C. Oxley, .L. Smith, W. Wang, "Compatibility of Ammonium Nitrate with Monomolecular Explosives, Part I," . Phys. Chem., 98 (1994) 3893-3900. .C. Oxley, .L Smith, W. Wang, "Compatibility of Ammonium Nitrate with Monomolecular Explosives, Part II Nitroarenes," . Phys. Chem., 98 (1994) 3901-3907. 

Shock involves motion - that of a falling weight which impacts other matter, that of two railroad trains in collision or that of the highly compressed gases in a detonation which occupy the reaction zone back of the shock zone, which impacts the next monomolecular layer of undecomposed explosive. The velocity of such motion therefore is an important factor in the shock value of the phenomenon... 

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