Andesitic rock is an igneous rock with a composition in between that of basaltic and granitic igneous rock.
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Igneous rock with a mineral composition between that of basaltic and granitic rock. Light colored igneous rock of lower density than basaltic rock formed from magma rich in silica but poor iron and magnesium. Rich in quartz and potassium feldspar. This magma is thick and stiff.
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Andesitic rock is an 'igneous rock' with a composition in between that of 'basaltic' and 'granitic igneous rock'. It is an extrusive volcanic rock with moderate temperatures and viscosity.
EXPLANATION:
It is found in the 'Andes Mountains' of South America, thus derived the name "andesite”.
These rocks are finely grained and are formed when 'magma erupts' on the surface and are crystallized. They cool down so quickly such that they can form amorphous glass on crystallization.
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