True granite according to modern petrologic convention contains both plagioclase and alkali feldspars. When a granitoid is devoid or nearly devoid of plagioclase the rock is referred to as alkali granite. When a granitoid contains <10% orthoclase it is called tonalite; pyroxene and amphibole are common in tonalite. A granite containing both muscovite and biotite micas is called a binary or two-mica granite. Two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites. The volcanic equivalent of plutonic granite is rhyolite.

(1) plutonic or intrusive igneous rocks that solidified deep within the earth
(2) volcanic, or extrusive, igneous rocks formed at the Earth's surface
(3) Mafic is an adjective describing a silicate mineral or rock that is rich in magnesium and iron;