Obsidian
is a type of natural occurring glass formation produced when
lava flows from a volcano and cools rapidly without sufficient
time for crystal growth to start. Obsidian is commonly found
within rhyolitic lava flows known as obsidian flows. Not a true
mineral because as a glass it is not crystalline; its composition
is too complex
to comprise just a single mineral.
Because
obsidian is metastable at the earth's surface, no obsidian has
been found that is older than Cretaceous age, this breakdown of
obsidian is accelerated by the presence of water. Pure obsidian
is usually dark in appearance, though the color varies depending
on the presence of impurities. Iron and magnesium give the obsidian
a dark green, brown or black color. In some stones, the inclusion
of small, white clustered crystals of cristobalite in
the black glass produce a snowflake pattern (snowflake obsidian).
They may also contain patterns of gas bubbles that remained from
the lava flow, these bubbles can produce interesting multicolor
effects such
as rainbow or velvet obsidian or a silver or rarer golden
sheen effect.
 
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BULLSEYE
RAINBOW CAB
Origin: Chihuahua,
México
Cabochon Size:
39mm x 46mm x 11mm
Weight: 24.0 grams
Price: $24.00 OB503
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RAINBOW
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
43mm x 22mm x 10mm
Weight: 10.1 grams
Price: $12.00 OB551
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VELVET
OBSIDIAN
CABOCHON
Origin: Chihuahua,
México
Cabochon Size:
48mm x 25mm x 7mm
Weight: 11.1 grams
Price: $24.00 OB394
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PURPLE
RAINBOW
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
36mm x 21mm x 7mm
Weight: 5.4 grams
Price: $28.00 OB569
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PEARL
RAINBOW
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
35mm x 20mm x 9mm
Weight: 7.4 grams
Price: $14.00 OB585
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MAHOGANY
HAZE
OBSIDIAN
Origin: Utah,
USA
Cabochon Size:
35mm x 20mm x 8mm
Weight: 7.4 grams
Price: $12.00 OB449
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RAINBOW
FREEFORM
CAB
Origin: Chihuahua,
México
Cabochon Size:
38mm x 17mm x 6mm
Weight: 5.2 grams
Price:$12.00 OB533
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GOLD
SHEEN
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
36mm x 25.5mm x 9mm
Weight: 11.8 grams
Price: $20.00 OB528
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MAHOGANY
HAZY OBSIDIAN
Origin: Utah,
USA
Cabochon Size:
34mm x 24mm x 8.5mm
Weight: 9.2 grams
(semi-transparent)
Price: $10.00 OB535
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MAHOGANY
HAZE
TEARDROP CAB
Origin: Utah,
USA
Cabochon Size:
39mm x 23mm x 6.5mm
Weight: 7.1 grams
(semi-transparent)
Price: $15.00 OB536
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LARGE
RAINBOW
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
40mm x 39mm x 9mm
Weight: 14.8 grams
Price: $18.00 OB581
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PURPLE
RAINBOW
OBSIDIAN CAB
Origin: Chihuahua,
México
Cabochon Size:
38mm x 17mm x 8mm
Weight: 6.2 grams
Price: $25.00 OB570
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BLUE
VELVET
OBSIDIAN
Origin: Chihuahua,
México
Cabochon Size:
27mm x 18mm x 9mm
Weight: 5.4 grams
Price: $24.00 OB541
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