Rhyolite( die) Australia

The cost of dies per piece with a choice
The length of the dies is 39 - 40 mm
width 29 - 32mm
Weight from 18,2 grams to 21,1 grams.

Sometimes multiple samples from the total mass has a small notch,neopalymivka.

To refer to silicate rocks of volcanic origin is recommended to use the word "rhyolite».
Sometimes the rhyolite is very beautiful, as presented to your attention almost brought to mirror Shine dies..
Dies of bright expressive rhyolite with porphyrins of orange feldspar and caverns filled with gray - blue translucent chalcedony.

Rhyolite is not necessarily formed from lava, but necessarily from the products of volcanic activity.
Heavy gas-saturated magma, coming to the day surface of the planet, can stop its movement at the stage of formation of a volcanic dome, and this dome will consist of a rhyolite.

The composition of rhyolite, in addition to silica, usually includes feldspar, quartz. Frequent impurities are pyroxene, plagioclase, Jasper. Occasionally, small inclusions of biotite are observed in rhyolites. Hornblende in acicular rhyolites kristallizuetsya in education.

The mineralogical and chemical composition of rhyolite is very similar to granite.

Due to the high content of silicon oxide, rhyolite is usually light (often grayish), and its structure is glassy. Released, but not evaporated gases make rhyolite porous – although more often this rock has a fine-grained structure.