The molecular sieve aluminum phosphate number 5 (AlPO4-5) was crystallized through microwave heating of reagents initially confined in water-in-toluene microemulsion droplets. The surfactant cetyltrimethylammonium bromide and cosurfactant butanol were used to form the microemulsion. By adjusting the microemulsion composition, the crystal morphology could be altered. Several novel crystal shapes were produced. The diversity of the observed crystal morphology suggests that there is a complex interplay of reagent confinement, crystal growth rate, and adsorption of some of the microemulsion components onto the growing crystal surface in affecting crystal nucleation and growth. The novel crystals may find application in optical devices, membranes, and catalysis.