Sandstone: It is a kind of sedimentary rock, which is formed by stone particles deposited on the river bed through water erosion, and become solid after thousands of years of accumulation. Later, the mine was formed due to the earth's orogenic movement.
Main ingredients: quartz, clay, calcium, iron, ore, and other substances.
Sandstone is a kind of matt stone, which will not produce light pollution caused by light reflection, and it is also a natural non-slip material. Marble and granite are smooth stone, only light can show decorative effect, which is prone to light pollution. Sandstone is a zero-radioactive stone.
Whetstone
Whetstone is the finer grinding stone and also divided into grain size.
The whetstones in western Hubei are divided into three types: coarse, fine and whetstone.
Coarse grindstone is rough and "eats" iron quickly, so farmers use it to grind blunt and chipped furniture.
There are several kinds of whetstones in Cuiwei Mountain, including shale, siltstone, sandstone, etc., which contain a lot of clay substances, which can sharpen various cutting tools such as kitchen knives, scissors, machete, guillotine, razor, and axe.
