දඹ පළිඟු

විකිපීඩියා, නිදහස් විශ්වකෝෂය වෙතින්
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දඹ පළිඟු
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Amethyst cluster from Magaliesburg, South Africa.
General
CategoryMineral variety
රසායනික සූත්‍රයසිලිකා (silicon dioxide, SiO2)
Identification
පාට / පැහැයදම් පාට
Crystal habit6-sided prism ending in 6-sided pyramid (typical)
Crystal systemrhombohedral class 32
TwinningDauphine law, Brazil law, and Japan law
Cleavageනැත
FractureConchoidal
Mohs scale hardness7–lower in impure varieties
LusterVitreous/glossy
Streakසුදු
DiaphaneityTransparent to translucent
Specific gravity2.65 constant; variable in impure varieties
Optical propertiesUniaxial (+)
Refractive indexnω = 1.543–1.553
nε = 1.552–1.554
Birefringence+0.009 (B-G interval)
Pleochroismනැත
Melting point1650±75 °C
Solubilityinsoluble in common solvents
Other characteristicsPiezoelectric
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