Rholite To A Granite

Granite and rhyolite have exactly the same chemical composition.

Rholite to a granite.

Gneiss also has the same composition and it forms from long and intense metamorphism of. Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock and consequently outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents rhyolitic magmas form highly viscous lavas they also occur as breccias or in volcanic plugs and dikes rhyolites that cool too quickly to grow crystals form a. In such cases the rock may consist principally of well developed large single crystals phenocrysts at the time of extrusion.

Appearance of granite is veined or pebbled and that of rhyolite is banded. Hardness of granite and rhyolite is 6 7. Rhyolite extrusive igneous rock that is the volcanic equivalent of granite most rhyolites are porphyritic indicating that crystallization began prior to extrusion. They consist primarily of quartz and feldspar.

Such a rock is called granite when it consists of coarse grains fit tightly together. Rhyolite rocks bear a striking resemblance to granite due to being classified as felsic rocks except that rhyolite has a fine grained texture with phenocrysts which are small crystals sometimes embedded within the rock. The rock received its name from german geologist ferdinand von richthofen better known as the red baron a world war i flying ace the word rhyolite comes from the greek word rhýax a stream of lava with the suffix ite given to rocks. Rhyolite is a silica rich igneous rock found throughout the world.

The minerals that make up the composition of this rock are mica feldspar quartz and hornblende. Rhyolite is similar in composition and appearance to granite but it forms through a. Crystallization may sometimes have begun while the magma was deeply buried.