Kyanite stone is found in "Bahia Brazil" and has chemical and physical properties, including:

Physical properties

• The shape we pray
• Silicate minerals group
  
• Colorless scratching
• Hardness 4.5 / 6
• Color blue / green
• Transparent / semi-transparent
• Vitreous sparkle

Chemical properties

• Refractive index 1.71 / 1.73
• Density 3.6
• Three-tilt Crystal System
• The chemical formula is aluminum silicate