Andalusite stone is found in Spain

It is characterized by the following chemical and physical properties:

Physical properties

• Prismatic
• Silicate minerals group
  
• White scratching
• Hardness 6.5 / 7.5
• Pink/Brown/White/Grey/Purple/Yellow/Blue
• Transparent to opaque
• Vitreous sparkle

Chemical properties

• Refractive index 1.63 / 1.64
• Density 3.2
• A rhombic system of crystals exists
• The chemical formula is aluminum silicate