Properties
Physical Properties
Hardness
5.5-6
7
Grain Size
Fine Grained
Fine Grained
Fracture
Conchoidal
Uneven, Splintery or Conchoidal
Streak
Black
White
Porosity
Less Porous
Highly Porous
Luster
Greasy to Dull
Waxy and Dull
Compressive Strength
200.50 N/mm2
9
Not Available
Cleavage
Not Available
Non-Existent
Toughness
2.1
1.5
Specific Gravity
2.34-2.40
2.5-2.8
Transparency
Opaque
Translucent to Opaque
Density
Not Available
2.7 g/cm3
Thermal Properties
Specific Heat Capacity
1.12 kJ/Kg K
7
0.74 kJ/Kg K
19
Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
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