The hardness distinction of natural granite and marble

Marble: because marble generally contains impurities, and calcium carbonate in the atmosphere by carbon dioxide, carbide, water vapor, also easy to weathering and dissolution, and make the surface quickly lose luster.So a few, such as white marble, Ai yeqing qualitative pure, impurity less stable and durable varieties can be used at outdoor, other varieties should not be used at outdoor, generally only used at indoor decorative surface.Mohs hardness is 3-5.

Granite: the hardness of granite is higher than marble, thus processing hard, but acidproof, weathering corrosion.It is not easy to be weathered, and the appearance of color and lustre can be maintained for more than one hundred years, so it is mostly used for wall foundation and exterior wall veneering.As granite hardness is higher, wear-resisting, so also often used in advanced building decoration projects, for example, the ground of the lobby.Mohs hardness between 6 and 7.

Mohs hardness knowledge:

Mohs hardness: It is used to compare the hardness of minerals. The hardness of minerals refers to the ability of minerals to resist the invasion of external mechanical action.Moire hardness is a order of hardness, and in fact the hardness difference between diamond and corundum is much greater than the sum of the hardness difference between corundum and talc.

Commonly used Mohr hardness: 1, talc 2, gypsum 3, calcite 4, fluorite 5, apatite 6, feldspar 7, quartz 8, topaz 9, corundum 10, diamond and metal hardness test, the use of Brinell hardness, Rockwell hardness, Vickers hardness, etc.