AMETHYST?????
           
 
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AMETHYST

           
 
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AMETHYST
Gemstone:
Shape:
Weight (ct):
 to
 
 
Amethyst Facts 
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
Refractive index nω = 1.543–1.553 nε = 1.552–1.554
Optical Properties Uniaxial (+) (Positive)
Birefringence +0.009 (B-G interval)
Pleochroism None
Streak White
Specific gravity 2.65 constant; variable in impure varieties
Melting point 1650±75 °C
Solubility H2O insoluble
Diaphaneity Transparent to translucent
Other Characteristics Piezoelectric