OPAL ROUGH FROM MT SHASTA USA 29.15 CT [VS5123]

Item Information

Dimensions (mm) 30 x 16 x 11mm
Weight (carats) 29 carats
Colors

VOLCANIC OPALS

MT SHASTA OPAL ROUGH

This is a specimen of rough mined at the base of Mt Shasta in California USA.It is formed of silica but lacks the fire of opal.Some  parts are transparent with a green hue.

Weight 29.15 cts app

Size 30 x 16 x 11 mm app

About 593,000 years ago andesitic lavas erupted in what is now Mount Shasta's western flank near McBride Spring. Over time an ancestral Mount Shasta stratovolcano was built to large but unknown height; sometime between 300,000 to 360,000 years ago the entire north side of the volcano collapsed, creating an enormous landslide or debris avalanche,

The next cone to form is exposed south of Mount Shasta's current summit and is called Misery Hill. It was formed 15,000 to 20,000 years ago from pyroxene andesite flows and has since been intruded by a hornblende dacite dome.

2d 13h 11m 26s

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Pricing & Details

Bid Increment $1.00
Starting Bid $17.00
Auction ID 269160
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Viewed 639 times
Starts 8th Dec 2016 6:03pm PST
Ends 12th Dec 2016 6:00pm PST

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