OPAL ROUGH FROM MT SHASTA USA 71.35 CT [VS5117]

Item Information

Dimensions (mm) 38 x 34 x 10mm
Weight (carats) 71 carats

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 71.35 cts app

Size 38 x 34 x 10 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.

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$48.00 stix68
19th Nov 2013 11:56pm PST
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Pricing & Details

Bid Increment $1.00
Starting Bid $48.00
Auction ID 269076
Watchers 0 watching
Viewed 982 times
Starts 19th Nov 2013 10:03pm PST
Ends 20th Nov 2013 10:00pm PST

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