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