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
Lilyvale, The Rocks decades of the 20th century. The buildings on the site combine to form an interesting group, reminiscent of the lively and diverse early streetscapes and urban scale of The Rocks. "Lilyvale" was listed on the New South Wales State Heritage Register on 10 May 2002 having satisfied the following criteria. The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales. "Lilyvale" (176 Cumberland Street) is an integral component of a group of 19th century houses in this section of Cumberland Street, which collectively illustrate the range, diversity and urban scale of