Topaz stone is found in the Russian Ural Mountains and has the following chemical and physical properties:

Physical properties

• Prismatic
• Silicate minerals group
• The scratch is white / colorless
• Hardness 8
• The color is colorless / blue / yellow / pink / brown / green
• radiant
• Transparent / semi-transparent
• The sparkle is glassy
• Double refractive shape

Chemical properties

• Refractive index 1.62 / 1.63
• Density is 3.4 / 3.6
• The chemical formula of fluorine / aluminum silicate
• Not dissolve