$25.00 USD
Cijena
6117
6

RHYOLITE SPECIMEN -POLISHED 66 GRAMS [MX956A ]

SKU
Dimenzije (mm)
x x mm
Težina (cts)
Boje

 

RHYOLITE FROM MT MAY

QUEENSLAND- RAINFOREST JASPER

NATURAL

POLISHED ONE SIDE

WEIGHT 66 GRAMS APP

SIZE 80 X 55 X7 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.

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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
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  • royrock
    royrock
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    Beautiful agate piece , and as always fast efficient service from Sedagems

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Identifikacijski broj proizvoda : 75718
Počinje : 12th November 2024 12:00 pm PST
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