RHYOLITE SPECIMEN -POLISHED -72 GRAMS [MX949 ]

Item Information

Dimensions (mm) not provided
Weight (carats) not provided
Colors

 

RHYOLITE FROM MT MAY

QUEENSLAND- RAINFOREST JASPER

NATURAL

POLISHED ONE SIDE

WEIGHT 72 GRAMS APP

SIZE 90 X 68 X 7 MM APP

Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcroppings of it often bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They can also occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice. Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra or of ignimbrites.

1d 6h 9m 4s

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Pricing & Details

Bid Increment $1.00
Starting Bid $29.00
Auction ID 75710
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Starts 6th Dec 2016 12:02pm PST
Ends 12th Dec 2016 12:00pm PST

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