Properties of Coal and Obsidian

Coal

Obsidian

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1 Properties

1.1 Physical Properties

1.1.1 Hardness

1-1.55-5.5

1 7

1.1.2 Grain Size

Medium to Fine Coarse Grained

Not Applicable

1.1.3 Fracture

Conchoidal

1.1.4 Streak

Black

White

1.1.5 Porosity

Less Porous

Very Less Porous

1.1.6 Luster

Dull to Vitreous to Submetallic

Vitreous

1.1.7 Compressive Strength

NA0.15 N/mm²

0.15 450

1.1.8 Cleavage

Non-Existent

1.1.9 Toughness

Not Available

1.1.10 Specific Gravity

1.1-1.42.6-2.7

0 8.4

1.1.11 Transparency

Opaque

Translucent

1.1.12 Density

1100-1400 g/cm³2.6 g/cm³

0 1400

1.2 Thermal Properties

1.2.1 Specific Heat Capacity

1.32 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

1.2.2 Resistance

Heat Resistant

Heat Resistant, Impact Resistant

Coal vs Obsidian Properties

Properties of Coal and Obsidian play an important role in determining the type of rock. Along with Coal vs Obsidian properties, get to know more about Coal Definition and Obsidian 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 Coal and Obsidian.