Properties
Physical Properties
Hardness
6-7
6
Grain Size
Medium to Fine Coarse Grained
Not Applicable
Fracture
Conchoidal
Conchoidal
Streak
Bluish Black
White to Grey
Porosity
Very Less Porous
Less Porous
Luster
Subvitreous to Dull
Not Available
Compressive Strength
Not Available
37.50 N/mm2
27
Cleavage
Not Available
Not Available
Toughness
2.1
2.3
Specific Gravity
2.86-3
2.8-3
Transparency
Opaque
Opaque
Density
2.73 g/cm3
2.9-3.1 g/cm3
Thermal Properties
Specific Heat Capacity
0.92 kJ/Kg K
10
0.84 kJ/Kg K
15
Resistance
Heat Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Pressure Resistant, Wear Resistant
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