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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FREEFORM
OBSIDIAN CAB

Origin: Chihuahua, México
Cabochon Size:
39mm x 14mm x 8mm
Weight: 5.0 grams

Price: $12.00         OB520

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VELVET DESIGNER
OBSIDIAN CAB

Origin: Jalisco, México
Cabochon Size:
47mm x 42mm x 6.5mm
Weight: 14.4 grams

Price: $30.00         OB640

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GOLD SHEEN
HEART CABOCHON

Origin: Chihuahua, México
Cabochon Size:
32mm x 34mm x 7mm
Weight: 10.5 grams
(very rare)

Price: $22.00          OB527

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BLUE VELVET
OBSIDIAN

Origin: Chihuahua, México
Cabochon Size:
37mm x 30mm x 16mm
Weight: 18.9 grams
(rounded both sides)

Price: $26.00         OB625

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SILVER SHEEN
FREEFORM CAB

Origin: Chihuahua, México
Cabochon Size:
47mm x 23.5mm x 7mm
Weight: 9.6 grams

Price: $20.00           OB605

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GREEN VELVET
OBSIDIAN

Origin: Chihuahua, México
Cabochon Size:
42.5mm x 21mm x 7mm
Weight: 8.0 grams

Price: $18.00         OB594

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SPIDERWEB
OBSIDIAN CAB

Origin: Chihuahua, México
Cabochon Size:
37mm x 24mm x 7mm
Weight: 8.5 grams

Price: $14.00      OB616

RAINBOW
OBSIDIAN PALM

Origin: Chihuahua, México
Cabochon Size:
36mm x 17mm x 8.5mm
Weight: 6.5 grams
(rounded both sides)

Price: $15.00         OB624

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SILVER SHEEN
TRIANGLE CAB

Origin: Chihuahua, México
Cabochon Size:
51mm x 25mm x 8mm
Weight: 13.5 grams

Price: $24.00           OB602

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GOLD SHEEN
BRILLIANT CAB

Origin: Chihuahua, México
Cabochon Size:
60mm x 26mm x 9mm
Weight: 17.5 grams
(very rare)

Price: $26.00         OB601

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GREEN VELVET
OBSIDIAN

Origin: Chihuahua, México
Cabochon Size:
43.5mm x 26mm x 9mm
Weight: 13.3 grams

Price: $12.00         OB609

VELVET OBSIDIAN
CABOCHON

Origin: Chihuahua, México
Cabochon Size:
33mm x 25mm x 8.5mm
Weight: 9.1 grams

Price: $10.00         OB645

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TEARDROP VELVET
OBSIDIAN CAB

Origin: Jalisco, México
Cabochon Size:
43mm x 19mm x 7mm
Weight: 7.0 grams

Price: $22.00         OB643

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SILVER SHEEN
DIAMOND CAB

Origin: Chihuahua, México
Cabochon Size:
35mm x 38mm x 5mm
Weight: 9.2 grams

Price: $20.00           OB599