Properties of Obsidian and Anthracite

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Obsidian

☒

Anthracite

☒

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Obsidian

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Anthracite

Obsidian

Obsidian

Anthracite

Anthracite

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Properties

Hardness

Grain Size

Fracture

Streak

Porosity

Luster

Compressive Strength

Cleavage

Toughness

Specific Gravity

Transparency

Density

Specific Heat Capacity

Resistance

5-5.5

-

Conchoidal

White

Very Less Porous

Vitreous

0.15 N/mm²

-

-

2.6-2.7

Translucent

2.6 g/cm³

0.92 kJ/Kg K

Heat Resistant, Impact Resistant

1-1.5

Medium to Fine Coarse Grained

Conchoidal

Black

Less Porous

Shiny

-

-

-

1.1-1.4

Opaque

1.25-2.5 g/cm³

1.32 kJ/Kg K

Heat Resistant, Water Resistant

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Obsidian

Andesite

Obsidian vs Andesite

Obsidian

Scoria

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Obsidian

Peridotite

Obsidian vs Peridotite

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Peridotite

Definition | Texture | Uses | Types

Porphyry

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Kimberlite

Definition | Texture | Uses | Types

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Anthracite

Diorite

Anthracite vs Diorite

Definition | Texture | Uses | Types

Anthracite

Gabbro

Anthracite vs Gabbro

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Anthracite

Rhyolite

Anthracite vs Rhyolite

Definition | Texture | Uses | Types