|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
BLUE OREGON OPAL
This is a natural untreated parcel of opal with a blue tone from the oregon opal field that has been drilled.
Weight 13.45 cts app
Size 15 x 11 x 5 mm app
Mohs’ Hardness: 5.5 – 6.5
Density: 1.98 – 2.50
Composition: Hydrous silicon dioxide (SiO2· nH2O)
The opals are found in rhyolite geodes (thundereggs) in a perlite that has altered to a pastel colored clay. The geodes that contain gem-quality opal are only about 10% of the total geodes mined and only about 1% of the geodes contain gem-quality opal with play of color. The remaining geodes contain agate, quartz crystals, or common opal. The geodes vary greatly in size, from a few centimeters in diameter to over a meter.
The Opal Sheriff program allows our members to request an audit on any auction, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.
|Starts||14th Jul 2009 9:00pm PDT|
|Registered Shipping||$15.00||21 days|
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