Amethyst stone is found in "Colorado" and "America" ​​and has the following physical and chemical properties:

Physical properties

• The shape is prismatic / limbs hierarchical
• Silicate minerals group
  
• White scratching
• Hardness 7
• The color is purple
• Translucent / Opaque
• Vitreous sparkle

Chemical properties

• Refractive index 1.54 / 1.55
• Hexagonal / triple crystal system
• The chemical formula is silicon oxide