News - Why is granite stone so strong and durable?

Why is granite stone so strong and durable?
Granite is one of the strongest rocks in the rock. It is not only hard, but not easily dissolved by water. It is not susceptible to erosion by acid and alkali. It can withstand more than 2000 kg of pressure per square centimeter. Weathering does not have an obvious effect on it for decades.

The appearance of granite is still quite beautiful, often appear black, white, grey, yellow, flower color, rose and so on shallow color, intersperse the black spot, beautiful and generous. The above advantages, it becomes the top choice in the construction stone. The heart stone of the monument to the people's heroes in Beijing's tiananmen square is made from a piece of granite that has been shipped from laoshan, shandong province.

Why does granite have these characteristics?
Let's examine its ingredients first. Of the mineral particles that make up the granite, more than 90% are the two minerals, feldspar and quartz, which are also the most feldspar. Feldspar is often white, gray, red, and quartz is colorless or gray, which make up the basic hues of granite. Feldspar and quartz are hard minerals and hard to move with steel knives. As for the dark spots in the granite, mainly black mica and other minerals. Although the black mica is soft, it is not weak in resisting pressure, and its components in granite are very small, often less than 10%. This is the very solid material condition of the granite.
Another reason the granite is strong is that its mineral grains are tightly buttoned to one another, and that the pores often account for less than 1% of the total volume of the rock. This gives the granite the ability to resist strong pressure and is not easily penetrated by water.

Granite though is particularly strong, but in the long term of sunshine, air, water and biology, there will be a day of "rotten", can you believe it? Many of the sand in the river is the quartz grains that have been left behind after it has been destroyed, and the widely distributed clay is also a product of the weathering of the granite. But it's going to be a long, long time, so in terms of human time, granite is pretty solid.