ایمتھسٹ
General
CategoryMineral variety
Chemical formulaSilica (silicon dioxide, SiO2)
Identification
ColorViolet
Crystal habit6-sided prism ending in 6-sided pyramid (typical)
Crystal systemrhombohedral class 32
TwinningDauphine law, Brazil law, and Japan law
CleavageNone
FractureConchoidal
Mohs scale hardness7–lower in impure varieties
LusterVitreous/glossy
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.65 constant; variable in impure varieties
Optical propertiesUniaxial (+) (Positive)
Refractive indexnω = 1.543–1.553 nε = 1.552–1.554
Birefringence+0.009 (B-G interval)
PleochroismNone
Melting point1650±75 °C
SolubilityH2O insoluble
Other characteristicsPiezoelectric

ایمتھسٹ (amethyst) (یاقوت ارغوانی) کاسنی رنگ دا اک کوارٹز اے جیہڑا نگ پتھر وچ شمار کیتا جاندا اے ۔