Surface structures on NaCl crystals detectable by the electron microscopic image with step heights down to one interplanar spacing, are described. The corresponding forms of producing the structures are discussed. Structures obtained by evaporation in a high vacuum are of special interest, as they are well reproducible. The conditions for the surface decoration method used for the image formation are discussed. First investigations to form images of monoatomic steps by means of the decoration method also on metal crystals show that this is possible under certain conditions.