Particle transporting (FLIBE)

How can I define FLIBE as a target in Geant4? Extended examples in TestEm11

If you go to the Wikipedia page FLiBe you will see that FLiBe can be thought of as a stoichiometric compound Li2BeF4 with density 1.94g/cm3. You can then use the same approach as is used to define the material H2O (“Water”) (lines 121-124 in TestEm11