Mohs scale of mineral hardness incorporates additional substances that may fall between levels: Comparison between hardness (Mohs) and hardness (Vickers): Mohs scale of mineral hardness The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. Created in 1812 by German geologist and mineralogist Friedrich Mohs, it is one of several definitions of hardness in materials science, some of which are more quantitative. The method of comparing hardness by seeing which minerals can visibly scratch others is, however, of great antiquity, having been mentioned by Theophrastus in his treatise
Orient Hotel, The Rocks of The Rocks under SCRA erupted in 1973 in organised community protests supported by the NSW Branch of the Builders Labourers' Federation. By 1975, SCRA's planning outlook had evolved to take into consideration cultural, social and historical values, but large scale developments continued. The Orient Hotel with its corner location and historic street presentation has contributed to the public's association of The Rocks with a unique historic neighbourhood. Around 1976, a company named Rocks Hotels Pty Ltd. took on the management of the hotel and in 1979 extensive alterations valued at $120,000 were completed to provide street facades approximating its