Spherulite

Spherulite (also Radiolith ) is a term from mineralogy and petrology, be designated by the round to spherical rock or mineral formations that occur in rocks either freely grown or as phenocrysts or inclusions.

Spherulitic rocks are predominantly found among the volcanic rocks such as porphyry and rhyolite, where one or more Gemengteile can be formed spherulitic.

Mineral spherulites are formed by many crystal fibers from radialstrahlig continue to grow at the same time by a nucleation and form spherical mineral aggregates. Examples of mostly free -growing, spherulitic mineral formations are Cacoxenite, Mesolith, Natrolite and Skolezit. The mineral occurs as Wavellite grown as grown into globular aggregates, and the quartz - cristobalite modification is known primarily in the form of white, spherical structures in the snowflake obsidian.