Cookies help us to give you the best experience. Are you ok with that? Agree Settings
Call +31 (0)412-405131
Login

Forgotten your password? Click here.

Register

  • NL
  • EN
  • DE
  • FR

Back from the gemshow in bangkok we bought the rare stone Sultanite ("Diaspore") against very good prices and furthermore 50-80% DISCOUNT on everything in Hall 2, 3 & 4 Lava outdoor images up to 70% off, all horns, shells and ocean drums also 60-70% Discount. Come quickly, very interesting! Raw stones and Madagascar products from as little as 1.50 / kilo.

< Back to overview

Rhyolite from Australia, tumbled

Rhyolite from Australia, tumbled

Product

Rhyolite from Australia, tumbled

Description

Beautiful and especially well-cut stones in top quality.

DOWNLOADS:

More information

The solidification ryolite or liparite is an effluent rock with a felsic composition, defined as more than 68% silica. The name ryolite is derived from Greek rhyx "lava flow" Ryolite, due to the extrusion of the rock, has small crystals. In the case of effluents, the magma (and from that moment called lava) cools rapidly to very quickly, leaving no time for the minerals to develop large crystals. Ryolite usually consists of minerals quartz, calivel spoon and plagioclase. Traces of more mafic minerals such as biotite, amphibious and pyroxen can be present in ryolites. Due to the high silica content in ryolite, the molten rock is very viscous (viscous). As a result, lava streams with a ryolite composition will be much less mobile than the low viscous mafic and thus fast-flowing basaltes. If ryolite cools so quickly that it can not form any crystals, it is spoken of a vitrophyric or volcanic glass. The best known variant of this is obsidian. Ryolites come across wherever high viscous magma despite sprays can reach the surface and quickly solidify. The deeper variants of ryolite are the pavement granopher and the deep-rooted granite. Ryolite, also known as koga in Japanese, occurs in hills of the Scottish Glen Coe valley such as Buachaille Etive Mòr, Niijima, Japan and Italian Lipari. Also on the New Zealand North Island and in Iceland there are Ryolite volcanoes. Due to the mineral composition, ryolite is often light in color. This color can also vary from white to pink to light green. Ryolite has a very bright color in the landscape, sometimes even so bright that it appears as if the light emits. Beautiful examples of this can be found at Landmannalaugar, an area in Iceland.

  

STRONG TRADEMARKS TIMMERSGEMS GROUP