Mohs scale of mineral hardness finding the hardest material that the given material can scratch, or the softest material that can scratch the given material. For example, if some material is scratched by apatite but not by fluorite, its hardness on the Mohs scale would fall between 4 and 5. "Scratching" a material for the purposes of the Mohs scale means creating non-elastic dislocations visible to the naked eye. Frequently, materials that are lower on the Mohs scale can create microscopic, non-elastic dislocations on materials that have a higher Mohs number. While these microscopic dislocations are permanent and sometimes detrimental to the harder material's structural
95-99 George Street, The Rocks aesthetically significant for containing some of the most intact Victorian period interiors for shops and residences in The Rocks area, including internal linings, joinery, some door and window furniture and an original plan form. 95-99 George Street makes an important contribution to the streetscape of George St, and is of significance in continuing the uniform character of the small scale retail shop buildings found in The Rocks. The building is aesthetically significant for its contribution to the streetscape of Greenway Lane, one of the pedestrian laneways in The Rocks area which are highly significant as evocation of the colonial townscape.