Why White Granite Has A Smaller Grain Size Than Rhyolite

Rhyolite and granite have the same chemical composition and are formed from the same type of liquid rock.

Why white granite has a smaller grain size than rhyolite.

Appearance of granite is veined or pebbled and that of rhyolite is banded. Occasionally it is light gray. 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.

Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. Whereas granite is the equivalent in. Why is the grain size of rhyolite less than 1mm while the grain size of granite is greater. 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. 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. 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.

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. In texture it is classified as aphanitic. The longer it takes to cool the larger the grain. The difference is the size of grains.

The rapid cooling only allows small crystals to form. Rhyolite is the felsic igneous rock with fine grained size. It is composed of the light colored silicates and is usually buff to pink in color. Occasionally it is light gray.

Rhyolite which cools at the surface cools much more quickly than granite which cools underground. It 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. This doesn t allow a lot of time for crystals to grow in the rock.

Why does rhyolite have smaller crystals than granite. Rhyolite has a composition similar to granite but has a much smaller grain size. Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice.