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Properties of Obsidian and Slate


Properties

Physical Properties
  
  

Hardness
3-4   
5-5.5   

Grain Size
Very fine-grained   
Not Applicable   

Fracture
Splintery   
Conchoidal   

Streak
Light to dark brown   
White   

Porosity
Less Porous   
Very Less Porous   

Luster
Dull   
Vitreous   

Compressive Strength
30.00 N/mm2   
30
0.15 N/mm2   
33

Cleavage
Slaty   
Non-Existent   

Toughness
1.2   
Not Available   

Specific Gravity
2.65-2.8   
2.6-2.7   

Transparency
Opaque   
Translucent   

Density
2.6-2.8 g/cm3   
2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.76 kJ/Kg K   
17
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant, Impact Resistant   

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