ایمتھسٹ
Appearance
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 ۔