Coral stone is found in "Japan" / "Algeria" / "Malaysia" / "Africa" ​​and "Australia",

It is characterized by the following physical and chemical properties:

Physical properties

• Fig coral
• The group is an organic carbonate material
  
• The scratch is white
• Hardness 3.5
• Color red / pink / black / blue / golden

Chemical properties

• Refractive index 1.49 / 1.66
• Crystal system 2.7