A stone is present and has the following chemical and physical properties:

Physical properties

• Prismatic
  
• The Silcat Group
  
• White scratching
• Hardness 5.5 / 6.5
• black color
• dark
• The sparkle is glassy / glossy
• The refractive shape is monophonic
• Melting point is 1391 ° C

Chemical properties

• Refractive index 1.699/1.663
• Density 3.278
• Prismatic crystal system
• The chemical formula of mono-pyroxene