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Item:GIANT 20.81CT RARE LIGHT PEACH OBSIDIAN FROM JAVA

GIANT 20.81CT RARE LIGHT PEACH OBSIDIAN FROM JAVA

Item condition:--
Ended:Nov 08, 200917:11:16 PST
Bid history:3 bids
Winning bid:US $6.51
Shipping:$10.00Other (see description)See more services 

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$10.00
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gemstone-planet ( 2037)
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Other item info
Item number:120487914918
Item location:Sattahip, Chonburi, Thailand
Ships to:Worldwide
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 Description Shipping and payments
 
GIANT 20.81CT RARE LIGHT PEACH OBSIDIAN FROM JAVA
 Pieces:  1  Clarity:  VVS2
 Type:  Obsidian  luster:  Good
 Weight:  20.81ct  Origin:  Java
 Shape:  Oval  Hardness:  5 on Mohs Scale
 Size (lwh):  22.00mm x 17.35mm x 10.56mm  Treatment:  None
 Gem ID:  GP08336611  Color:  Peach
Clarity Scale
 IF:  Internally Flawless
 VVS  Very Very Slight Inclusions
 VS  Very slight Inclusions
 SI:  Slightly Included
 I1:  Included

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline; in addition, its composition is too complex to comprise a single mineral. It is sometimes classified as a mineraloid. Though obsidian is dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. Crystalline rocks with obsidian's composition include granite and rhyolite. Because obsidian is metastable at the Earth's surface (over time the glass becomes fine-grained mineral crystals), no obsidian has been found that is older than Cretaceous age. This breakdown of obsidian is accelerated by the presence of water. Obsidian has low water content when fresh, typically less than 1% water by weight. but becomes progressively hydrated when exposed to groundwater, forming perlite. Tektites were once thought by many to be obsidian produced by lunar volcanic eruptions, though few scientists now adhere to this hypothesis. Pure obsidian is usually dark in appearance, though the color varies depending on the presence of impurities. Iron and magnesium typically give the obsidian a dark green to brown to black color. A very few samples are nearly colorless. In some stones, the inclusion of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). It may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled. These bubbles can produce interesting effects such as a golden sheen (sheen obsidian) or a rainbow sheen (rainbow obsidian). Obsidian can be found in locations which have experienced rhyolitic eruptions. It can be found in Armenia, Canada, Chile, Greece, Iceland, Italy, Kenya, Mexico, New Zealand, Peru, Scotland, Turkey and United States. Obsidian flows which may be hiked on are found within the calderas of Newberry Volcano and Medicine Lake Volcano in the Cascade Range of western North America, and at Inyo Craters east of the Sierra Nevada in California. Yellowstone National Park has a mountainside containing obsidian located between Mammoth Hot Springs and the Norris Geyser Basin, and deposits can be found in many other western U.S. states including Arizona, Colorado, New Mexico, Texas, Utah, Oregon and Idaho.

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RETURN POLICY
CONTACT US FOR RETURN INSTRUCTIONS. You may return any item for a refund within 7 days of receipt! The item must be in original condition. We can not refund damaged items.
NO RESTOCKING FEES.

CONTACT
Our contact email is: support@gemstone-planet.net We answer every email within 24 hours, unless there is a public holiday. Please contact us through eBay if you experience any difficulties with our email address above. Also, make sure you adjust your spam filter to allow emails from us.

SHIPPING
We offer EMS, or Registered Mail.
1. EMS with insurance - $35.00  - 5-8 Days
2. EMS - $30.00 5-8 Days
3. Registered Mail - $10.00 - 14-21 Days (Italy & France may take up to 8 weeks) Combine shipping over 7 days with 6 items $10.00 - 14-21 Days
Shipping and handling
Item location: Sattahip, Chonburi, Thailand
Shipping to: Worldwide
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To
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Estimated delivery*
US $10.00
United States
Other (see description)
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Seller ships within 2 day after receiving cleared payment.
*The estimated delivery time is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
Domestic handling time
Will usually ship within 2 business days of receiving cleared payment.
Return policy
Item must be returned within
Refund will be given as
Return policy details
7 days after the buyer receives it
Money Back
The seller is responsible for return shipping costs.

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