Obsidian is a rock which is a type of naturally occurring glass, produced by volcanoes (igneous origin) when a
margins of felsic lava flows, where cooling is more rapid. Because of the lack of crystal structure, obsidian blade
surgical scalpel blades.
While a rock like basalt is dark because of ferromagnesian enrichment, obsidian consists mainly of silicon dioxide,
very similar to that of granite and rhyolite. It is sometimes classified as a Mineraloid because obsidian is
lunar volcanic eruptions, though few scientists now agree with this theory.
While pure obsidian is always dark in appearance, the color varies depending on the presence of impurities. Iron
small, white, radially clustered crystals of Cristobalite in the black glass develop a blotchy or snowflake pattern
rock was flowing before being cooled.
These bubbles can produce interesting effects
such as a golden or silver sheen, known as
Sheen Obsidian
or a multi-color rainbow sheen known as
Rainbow Obsidian
Another type of Obsidian called
Tri Flow Obsidian
has a mix of red/brown, black and clear swirls
or layers in it making it popular for knapping.
Another popular type has relatively equal swirls of red,
brown or golden coloring mixed with a black.
This is referred to as Mahogany Obsidian
as the swirls much resemble a woodgrain pattern.
Obsidian is relatively soft with a typical hardness rating of 5 to 5.5. Obsidian, unlike crystals, has no regular
form edges sharper than the finest steel blades. For this reason, obsidian was used by many native cultures to
are a myriad of colors, patterns and mixes of Obsidians, making them a very desirable collector item.
The name Obsidian (from the Latin obsidiana) comes from Obsius, the name of the ancient Roman who
Obsidian is a rock which is a type of naturally occurring glass, produced by volcanoes (igneous origin) when a
margins of felsic lava flows, where cooling is more rapid. Because of the lack of crystal structure, obsidian blade
surgical scalpel blades.
While a rock like basalt is dark because of ferromagnesian enrichment, obsidian consists mainly of silicon dioxide,
very similar to that of granite and rhyolite. It is sometimes classified as a Mineraloid because obsidian is
lunar volcanic eruptions, though few scientists now agree with this theory.
While pure obsidian is always dark in appearance, the color varies depending on the presence of impurities. Iron
small, white, radially clustered crystals of Cristobalite in the black glass develop a blotchy or snowflake pattern
rock was flowing before being cooled.
These bubbles can produce interesting effects
such as a golden or silver sheen, known as
Sheen Obsidian
or a multi-color rainbow sheen known as
Rainbow Obsidian
Another type of Obsidian called
Tri Flow Obsidian
has a mix of red/brown, black and clear swirls
or layers in it making it popular for knapping.
Another popular type has relatively equal swirls of red,
brown or golden coloring mixed with a black.
This is referred to as Mahogany Obsidian
as the swirls much resemble a woodgrain pattern.
Obsidian is relatively soft with a typical hardness rating of 5 to 5.5. Obsidian, unlike crystals, has no regular
form edges sharper than the finest steel blades. For this reason, obsidian was used by many native cultures to
are a myriad of colors, patterns and mixes of Obsidians, making them a very desirable collector item.
The name Obsidian (from the Latin obsidiana) comes from Obsius, the name of the ancient Roman who 
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