The simplest crystalline phase that is formed by spherical micelles is the micellar cubic, denoted by the symbol I1. This is
a highly viscous, optically isotropic phase in which the micelles are arranges on a cubic lattice. At higher amphiphile concentrations, the micellar cubic phase is converted to hexagonal phase, denoted by symbol HI. At more higher concentrations, the lamellar phase is formed (Lα). This phase consists of amphiphilic molecules arranged in bilayer sheers
separated by layers of water. For most amphiphiles that consist of a single hydrocarbon chain, one or more phases are formed at intermediate phase between the hexagonal phase and lamellar phase. This intermediate phase often is called a
cubic phase