What stone is the best, the best quality, the most natural and the healthiest for traditional stone mills? I heard that it is granite and bluestone, so how to distinguish between natural ones?

Stone mill needs several characteristics, one is hardness, the other is toughness, and the other is abrasiveness. Hardness is not enough, it is easy to disintegrate, toughness is not enough, it is easy to break, and abrasiveness is not enough.

Summarize the above points. At present, bluestone and granite are recognized as the best stone materials for stone grinding, among which white hemp is the best, hard enough and tough enough, and its wear resistance is the highest in the stone grinding market.

Stone characteristics and advantages of white hemp;

1, no deformation, high hardness and strong wear resistance.

2. Wear resistance, high temperature resistance and maintenance-free.

3, the physical stability, meticulous organization, particles falling off after being hit, no burr on the surface, no influence on the plane accuracy, stable material, and long-term non-deformation.

Small linear expansion coefficient, high mechanical precision, rust prevention, antimagnetic and insulation.

4. Fujian white hemp has excellent quality, high surface finish, corrosion resistance, acid and alkali resistance, high hardness density, high iron content and no radioactivity, which is equivalent to American white hemp.