Vermiculite Brick and Firebrick are two of the most vital bricks in an industry though they are vastly different when it comes to their composition and Attribute. But with the use of expanded vermiculite in making Vermiculite Brick, it gives it exceptional insulation as well as makes it lighter; thus, it can be conveniently employed where energy efficiency is on demand. On the other hand, old Firebrick is made mostly to withstand high temperatures with little or no insulation properties of vermiculite. It all revolves around what you are looking for in a material; insulation or temperature resistance.