Why White Granite Has A Smaller Grain Size Than Rhyolite

When we have to compare granite vs rhyolite the texture color and appearance plays an important role in determining the type of rock.

Why white granite has a smaller grain size than rhyolite.

Natural glasses like obsidian rhyolite glass cool so quickly that mineral grains do not have time to grow. Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice. Rhyolite has a composition similar to granite but has a much smaller grain size. The rapid cooling only allows small crystals to form.

It has a composition similar to granite but has a much smaller grain size. Ok i have this science homework that wasn t assigned at all until last minute notice so its mostly about comparing the two types of minerals. Rhyolite which cools at the surface cools much more quickly than granite which cools underground. Whereas granite is the equivalent in.

It is composed of the light colored silicates and is usually buff to pink in color. Here is the actual problem that my homework says. In texture it is classified as aphanitic. Rhyolite has smaller crystals than granite because rhyolite formed from lava and granite forms from magma.

Rhyolite which cools at the surface cools much more quickly than granite which cools underground. Occasionally it is light gray. It is composed of the light colored silicates and is usually buff to pink in color. Why does rhyolite have smaller crystals than granite.

This doesn t allow a lot of time for crystals to grow in the rock. The rapid cooling only allows small crystals to form. Since granite cools underground from magma largecrystals form because the magmahas a chance to cool slowly. Appearance of granite is veined or pebbled and that of rhyolite is banded.

Smaller than granite i think you can change the grain size of a metal by heating it up to its melting point and then allowing it to cool again. The difference is the size of grains. Rhyolite is the felsic igneous rock with fine grained size. Rhyolite and granite have the same chemical composition and are formed from the same type of liquid rock.

Slow cooling allows for a longer period of grain growth and a high water content in the magma favors higher in melt transport rates and more rapid grain growth than would occur in a dry magma of equivalent composition and temperature. The longer it takes to cool the larger the grain. Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors.