There is a stone today, which contains the source of calcium and magnesium carbonate. Between mountains and rivers, stone mines are widely distributed. This stone is also hidden in deep valleys, or exposed in high mountains.

Those who collect it need to observe its veins, distinguish its color and texture, and then they can get good products. Calcium and magnesium carbonate in the stone can be used for all kinds of purposes. Or calcined in kilns to obtain lime and the like, which is used to build walls and walls, to strengthen houses; or ground and refined, which is used as an adjuvant for medicine, to treat people's diseases; or used in workshops, as a raw material for utensils, and to cast exquisite things.

It is not easy for a man to find the source of calcium and magnesium carbonate. It is necessary to use a fine method to evaluate the terrain and explore the location of the stone. And when digging, when following the weather and the location, do not hurt the ecology. The stones picked are well used to live up to the treasures bestowed by heaven and earth.