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Obsidian rough material

Obsidian is natural glass. It is formed from volcanic activity and is found widely in the Western US as well as many parts of the world.

Because it is a common material, it is not very expensive. Most of the cost of Obsidian is due to the cost of transporting and slabbing it.

Because Obsidian is glass, care must be taken by the cutter while working on it that they don't break it and cut themselves on the sharp broken pieces.

Below, you will see examples of different varieties of Obsidian which we have in stock.

A chunk of black Obsidian.

Black Obsidian

This is a fairly typical example of black Obsidian.

Some pieces are very dense and opaque while others are varying amounts of translucency.

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A slab of Snowflake Obsidian.

Snowflake Obsidian

Snowflake Obsidian contains white spots which are caused by inclusions of a mineral called Cristobalite. They usually look like snowflakes when the spacing is just right.

A slab of nice Snowflake Obsidian.

Snowflake Obsidian

This is another nice slab of Snowflake Obsidian.

Another slab of Snowflake Obsidian.

Snowflake Obsidian

This is a slab of Snowflake Obsidian with snowflakes that are very close together.

A slab of Mahogany Obsidian.

Mahogany Obsidian

This variety of Obsidian known as Mahogany Obsidian has brown areas of coloration which sometime look like a wood grain pattern.

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Denton Anderson,
Gemologist & Gem Cutter
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Photo of Denton the gem cutter.

Graduate Gemologist, GIA, GG
Over 20 years of experience.