Do good or good is a granite stone stone?
The granite is grinding Zu, sandstone is a limestone, not only suitable for grinding, building materials. Estimated that the hardness is low, relatively soft and good processing, but it is not recommended to buy Sandstone grinding, it is easy to wear and tear, and its own color is relatively light, mixed in the food can not see clearly. Understand the stone, is sure to buy Granite, at least have to buy stone. Huian is the most famous stone. Can consider.
The stone is used for rice, wheat, beans and other food processing machinery, powder into a paste. Start with human or animal, to the Jin Dynasty, Han people invented water powered mill. Usually made of two pebbles. The mill is the two layer of the plane, and the joints of the two layers are textured, the grain moves from the top of the hole into the middle of the middle of the two layer, and moves outward along the grain. When the rolling is over the two layer, the grain is ground to form powder.
Do the best stone stone sandstone.Feldspathic sandstone (arkose) is a kind of sandstone with a content of more than 25%, which consists of feldspathic sandstone and lithic feldspathic sandstone. Generally coarse sand structure, meat red to gray, sorting and roundness change. Feldspathic sandstone is mainly composed of felsic rocks, such as granite and gneiss, which are mechanically weathered and transported in short distance.
