Why White Granite Has A Smaller Grain Size Than Rhyolite

Rhyolite is the felsic igneous rock with fine grained size.

Why white granite has a smaller grain size than rhyolite.

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. 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. This doesn t allow a lot of time for crystals to grow in the 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.

Natural glasses like obsidian rhyolite glass cool so quickly that mineral grains do not have time to grow. It has a composition similar to granite but has a much smaller grain size. When we have to compare granite vs rhyolite the texture color and appearance plays an important role in determining the type of rock. Rhyolite has a composition similar to granite but has a much smaller grain size.

Why does rhyolite have smaller crystals than granite. Why is the grain size of rhyolite less than 1mm while the grain size of granite is greater. Rhyolite is an extrusive igneous rock a felsic silica rich volcanic rock that includes obsidian and pumice. The rapid cooling only allows small crystals to form.

Whereas granite is the equivalent in. Granite is available in black grey orange pink white colors whereas rhyolite is available in grey white light black colors. Rhyolite which cools at the surface cools much more quickly than granite which cools underground. The longer it takes to cool the larger the grain.

Appearance of granite is veined or pebbled and that of rhyolite is banded. Since granite cools underground from magma largecrystals form because the magmahas a chance to cool slowly. Here is the actual problem that my homework says. It is composed of the light colored silicates and is usually buff to pink in color.

The rapid cooling only allows small crystals to form. Rhyolite has smaller crystals than granite because rhyolite formed from lava and granite forms from magma. Occasionally it is light gray. It frequently contains voids and glassy fragments evidence of having formed in a surface environment with.

In texture it is classified as aphanitic. Rhyolite which cools at the surface cools much more quickly than granite which cools underground. It is composed of the light colored silicates and is usually buff to pink in color.