The Harder The Stone Is, The More Difficult The Stone Processing

1. Hardness Generally, the harder the stone is, the more difficult the stone processing. Also more wear and tear to the tool. As its hardness enhance, its corrosion resistance also enhance, so the cutting resistance is increase. 2. Mineral composition and chemical composition The composition of stone includes mineral composition and chemical composition. Different mineral compositions and chemical compositions have different processing performances. For example, the main rock-forming minerals of marble are calcite and dolomite. Their Mohs hardness is 3 and 3.5-4, less than the hardness of granite, and is easier to process. The main rock-forming minerals of granite are quartz, orthoclase, plagioclase. Their Mohs hardness is 6.5-7. The stone processing ability much depends on the content of quartz and feldspar. The more the content is, the harder the stone processing. In the aspect of chemical composition, such as the SiO2, the more the content is, the harder the stone processing. 3. Structure of rock generally, the evengrained stone is easier to process than non-evengrained. The polishing quality of fine grain is higher than schistose. The glossiness of dense stone is higher than loosen one. High degree of crystal minerals, direction arrangement and same ray axis direction will improve the luster after polishing greatly. Source: stonebuy.com