ایمتھسٹ
| ایمتھسٹ | |
|---|---|
 | |
| General | |
| Category | Mineral variety |
| Chemical formula | Silica (silicon dioxide, SiO2) |
| Identification | |
| Color | Violet |
| Crystal habit | 6-sided prism ending in 6-sided pyramid (typical) |
| Crystal system | rhombohedral class 32 |
| Twinning | Dauphine law, Brazil law, and Japan law |
| Cleavage | None |
| Fracture | Conchoidal |
| Mohs scale hardness | 7–lower in impure varieties |
| Luster | Vitreous/glossy |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.65 constant; variable in impure varieties |
| Optical properties | Uniaxial (+) (Positive) |
| Refractive index | nω = 1.543–1.553 nε = 1.552–1.554 |
| Birefringence | +0.009 (B-G interval) |
| Pleochroism | None |
| Melting point | 1650±75 °C |
| Solubility | H2O insoluble |
| Other characteristics | Piezoelectric |
ایمتھسٹ (amethyst) (یاقوت ارغوانی) کاسنی رنگ دا اک کوارٹز اے جیہڑا نگ پتھر وچ شمار کیتا جاندا اے ۔