Mohs scale of mineral hardness 77 AD. While greatly facilitating the identification of minerals in the field, the Mohs scale does not show how well hard materials perform in an industrial setting. Despite its lack of precision, the Mohs scale is highly relevant for field geologists, who use the scale to roughly identify minerals using scratch kits. The Mohs scale hardness of minerals can be commonly found in reference sheets. Mohs hardness is useful in milling. It allows assessment of which kind of mill will best reduce a given product whose hardness is known. The scale is also in use at digital electronic manufacturers, for
107-109 George Street, The Rocks Regency Style. The buildings have been continuously occupied for commercial retail purposes since construction in 1861. The building's scale, detailing and alignment to the street is typical of that found along the west side of George Street and lining the harbourside as part of the Business Precinct of The Rocks. The buildings are part of the rich fabric of The Rocks which is highly regarded by residents, Sydney people and visitors and acknowledged by the Australian Heritage Commission and the National Trust as part of The Rocks Urban Conservation Area. The potential archaeological resource on the site is representative of