Why White Granite Has A Smaller Grain Size Than Rhyolite

Since granite cools underground from magma largecrystals form because the magmahas a chance to cool slowly.

Why white granite has a smaller grain size than rhyolite.

Rhyolite has a composition similar to granite but has a much smaller grain size. Natural glasses like obsidian rhyolite glass cool so quickly that mineral grains do not have time to grow. Whereas granite is the equivalent in. Rhyolite and granite have the same chemical composition and are formed from the same type of liquid rock.

The rapid cooling only allows small crystals to form. The longer it takes to cool the larger the grain. Appearance of granite is veined or pebbled and that of rhyolite is banded. Rhyolite has smaller crystals than granite because rhyolite formed from lava and granite forms from magma.

The rapid cooling only allows small crystals to form. Occasionally it is light gray. Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. In texture it is classified as aphanitic.

The difference is the size of grains. It frequently contains voids and glassy fragments evidence of having formed in a surface environment with. Here is the actual problem that my homework says. Why is the grain size of rhyolite less than 1mm while the grain size of granite is greater.

It has a composition similar to granite but has a much smaller grain size. It is composed of the light colored silicates and is usually buff to pink in color. Why does rhyolite have smaller crystals than granite. Occasionally it is light gray.

Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice. When we have to compare granite vs rhyolite the texture color and appearance plays an important role in determining the type of rock. Rhyolite is the felsic igneous rock with fine grained 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.

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. 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. It is composed of the light colored silicates and is usually buff to pink in color.