Why White Granite Has A Smaller Grain Size Than Rhyolite

Occasionally it is light gray.

Why white granite has a smaller grain size than rhyolite.

It is composed of the light colored silicates and is usually buff to pink in color. Why does rhyolite have smaller crystals than granite. The longer it takes to cool the larger the grain. Why is the grain size of rhyolite less than 1mm while the grain size of granite is greater.

Rhyolite is the felsic igneous rock with fine grained size. This doesn t allow a lot of time for crystals to grow in the rock. Natural glasses like obsidian rhyolite glass cool so quickly that mineral grains do not have time to grow. The rapid cooling only allows small crystals to form.

Rhyolite has a composition similar to granite but has a much smaller grain size. Rhyolite which cools at the surface cools much more quickly than granite which cools underground. Appearance of granite is veined or pebbled and that of rhyolite is banded. Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice.

Rhyolite and granite have the same chemical composition and are formed from the same type of liquid rock. In texture it is classified as aphanitic. It has a composition similar to granite but has a much smaller grain size. Here is the actual problem that my homework says.

It frequently contains voids and glassy fragments evidence of having formed in a surface environment with. The rapid cooling only allows small crystals to form. Occasionally it is light gray. 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.

Whereas granite is the equivalent in. 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. Rhyolite which cools at the surface cools much more quickly than granite which cools underground.

The difference is the size of grains. Since granite cools underground from magma largecrystals form because the magmahas a chance to cool slowly. Rhyolite has smaller crystals than granite because rhyolite formed from lava and granite forms from magma.