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Amethyst

Amethyst trillion cut
(a'-ma-thist)

9th c.; old fre. amatiste; lat. and gr. amethystos, amethyein

Variety of quartz, transparent, violet to purple color, one of the precious stones in the breastplate of the high priest and in the foundation of the New Jerusalem
Color
Light to dark purple
Family
Quartz
Chemical composition
SiO2
Crystal system
Hexagonal
Hardness (Mohs scale)
7
Specific gravity
2,66 ±0,01
Refractive index
1,544 - 1,553
Birefringence
0,009
Optical character
Uniaxial +
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