Why White Granite Has A Smaller Grain Size Than Rhyolite

Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice.

Why white granite has a smaller grain size than rhyolite.

Occasionally it is light gray. Whereas granite is the equivalent in. Rhyolite has smaller crystals than granite because rhyolite formed from lava and granite forms from magma. 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.

The rapid cooling only allows small crystals to form. When we have to compare granite vs rhyolite the texture color and appearance plays an important role in determining the type of rock. 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. 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. Why does rhyolite have smaller crystals than granite. Rhyolite is the felsic igneous rock with fine grained size. The rapid cooling only allows small crystals to form.

Rhyolite which cools at the surface cools much more quickly than granite which cools underground. Since granite cools underground from magma largecrystals form because the magmahas a chance to cool slowly. Rhyolite which cools at the surface cools much more quickly than granite which cools underground. Occasionally it is light gray.

In texture it is classified as aphanitic. It has a composition similar to granite but has a much smaller grain size. Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. It is composed of the light colored silicates and is usually buff to pink in color.

Rhyolite has a composition similar to granite but has a much smaller grain size. 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. Why is the grain size of rhyolite less than 1mm while the grain size of granite is greater. Natural glasses like obsidian rhyolite glass cool so quickly that mineral grains do not have time to grow.

It frequently contains voids and glassy fragments evidence of having formed in a surface environment with. The longer it takes to cool the larger the grain. Rhyolite and granite have the same chemical composition and are formed from the same type of liquid rock.