Properties of Obsidian and Coal
Properties
Physical Properties
Hardness
5-5.5
1-1.5
Grain Size
Not Applicable
Medium to Fine Coarse Grained
Fracture
Conchoidal
Conchoidal
Streak
White
Black
Porosity
Very Less Porous
Less Porous
Luster
Vitreous
Dull to Vitreous to Submetallic
Compressive Strength
0.15 N/mm2
33
Not Available
Cleavage
Non-Existent
Non-Existent
Toughness
Not Available
Not Available
Specific Gravity
2.6-2.7
1.1-1.4
Transparency
Translucent
Opaque
Density
2.6 g/cm3
1100-1400 g/cm3
Thermal Properties
Specific Heat Capacity
0.92 kJ/Kg K
10
1.32 kJ/Kg K
4
Resistance
Heat Resistant, Impact Resistant
Heat Resistant
Obsidian vs Coal Properties
Properties of Obsidian and Coal play an important role in determining the type of rock. Along with Obsidian vs Coal properties, get to know more about Obsidian Definition and Coal Definition. For the ease of understanding, the properties of rocks are divided into physical and thermal properties. Rocks have a variety of properties like hardness, color, specific gravity, fracture, cleavage, luster etc. Know all about physical and thermal properties of Obsidian and Coal.
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