ALLOTROPIC_PHASE
ALLOTROPIC_PHASE [phase name]*24 [data-type code]*8 [constituent] !
This keyword does the same as the COMPOUND_PHASE keyword for entering an allotropic phase (maximum 24 characters), but does not enter the constituent as a species to the data structure. Use this if the species is already defined.

ALLOTROPIC_PHASE BETHA-AL2O3 % AL2O3 !
ALLOTROPIC_PHASE CRISTOBALITE % SIO2 !
ALLOTROPIC_PHASE TRIDYMITE % SIO2 !