An architectural finish element operable to be placed adjacent similar architectural finish elements to form a finished surface on an architectural structure includes a body formed of a rock-based composite material comprising a low density solid particle additive, a plurality of unitary real stone veneer elements bonded to the body in courses extending in a first direction and in a random non-repetitive pattern, the real stone veneer elements having respective face surfaces generally lying in a plane to form an overall face surface of the architectural finish element. The low density solid particle additive is provided in an amount suitable to cause the architectural finish element to have a density of between about 10 to 15 pounds per square foot. The architectural finishing element may be mounted by mounting a portion of a body of at least one dual architectural finish element support to a surface of an architectural structure.