Quartz crystal hardness of the Mohs hardness of seven, have good mechanical properties, but the brittle, fragile, special attention in the processing. Due to the high hardness of the quartz crystal, it is usually used to grind and cut with abrasives above its hardness. Common abrasive See table below:
| Abrasive name | hardness | feature |
| Boron carbide（BC） | 10 | green |
| Natural emery（C） | 10 | High efficiency and long life span |
| Natural emery（AL203） | 7-9 | Commonly used |
| Natural white corundum（AL203） | 9 | Damage layer big |
| Artificial white corundum（AL203） | 9 | white |
| Artificial silicon carbide（SiC） | 9.5-9.75 | Light green or gray |