RHYOLITE SPECIMEN -POLISHED 66 GRAMS [MX956A ]
- Artikelnummer
- Abmessungen (mm)
- x x mm
- Gewicht (cts)
- Farben
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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.
- Artikelnummer
- Abmessungen (mm)
- x x mm
- Gewicht (cts)
- Farben
-
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.
Versandanbieter | Versand nach:Land | Versand in den Rest der Welt |
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FedEx | $12.00 / :Tage Tage | $39.00 / :Tage Tage |
:Land
FedEx erhält bei Bestellungen mit 2 oder mehr Artikeln einen Rabatt auf $12.00
Rest der Welt
FedEx erhält bei Bestellungen mit 2 oder mehr Artikeln einen Rabatt auf $39.00
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Registered Shipping | $9.00 / :Tage Tage | $16.00 / :Tage Tage |
:Land
Registered Shipping erhält bei Bestellungen mit 2 oder mehr Artikeln einen Rabatt auf $9.00
Rest der Welt
Registered Shipping erhält bei Bestellungen mit 2 oder mehr Artikeln einen Rabatt auf $16.00
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Positiv
Beautiful agate piece , and as always fast efficient service from Sedagems
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Positiv
Nice
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Positiv
Gorgeous stones, very happy
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Positiv
Gorgeous stone, very happy