The physical properties of amethyst are almost identical to the physical properties of other color varieties of quartz. The only important difference is the color of the material.
Physical Properties of Amethyst
| Chemical Classification | Silicate |
| Color | By definition, amethyst is purple in color, the most popular color is a reddish purple with rich saturation. |
| Streak | Colorless (harder than the streak plate) |
| Luster | Vitreous |
| Diaphaneity | Transparent to translucent |
| Cleavage | None – typically breaks with a conchoidal fracture |
| Mohs Hardness | 7 |
| Specific Gravity | 2.6 to 2.7 |
| Diagnostic Properties | Conchoidal fracture, glassy luster, hardness, purple color |
| Chemical Composition | SiO2 |
| Crystal System | Trigonal |
| Uses | Faceted stones, cabochons, beads, tumbled stones, ornamental objects. |