Properties of Gneiss and Coal

Gneiss

Coal

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1 Properties

1.1 Physical Properties

1.1.1 Hardness

71-1.5

1 7

1.1.2 Grain Size

Medium to Coarse Grained

Medium to Fine Coarse Grained

1.1.3 Fracture

Irregular

Conchoidal

1.1.4 Streak

White

Black

1.1.5 Porosity

Very Less Porous

Less Porous

1.1.6 Luster

Dull

Dull to Vitreous to Submetallic

1.1.7 Compressive Strength

125.00 N/mm²NA

0.15 450

1.1.8 Cleavage

Poor

Non-Existent

1.1.9 Toughness

1.2

Not Available

1.1.10 Specific Gravity

2.5-2.71.1-1.4

0 8.4

1.1.11 Transparency

Translucent to Opaque

Opaque

1.1.12 Density

2.6-2.9 g/cm³1100-1400 g/cm³

0 1400

1.2 Thermal Properties

1.2.1 Specific Heat Capacity

NA1.32 kJ/Kg K

0.14 3.2

1.2.2 Resistance

Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant

Heat Resistant

Gneiss vs Coal Properties

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