Amethyst
(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
Chemical composition
SiO2
Specific gravity
2,66 ±0,01
Refractive index
1,544 - 1,553
Optical character
Uniaxial +