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diorite
Sign in to savethumb|Diorite thumb|Orbicular diorite from Corsica (corsite) thumb|upright=1.7|QAPF diagram with dioritoid fields highlighted in yellow and diorite in red thumb|upright=1.4|Mineral assemblage of igneous rocks
Diorite is a coarse-grained igneous rock that forms when magma cools slowly beneath Earth's surface, typically composed of minerals like feldspar and hornblende. It has been valued throughout history as a stone for tools, sculptures, and building materials because of its durability and attractive appearance.
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thumb|Diorite thumb|Orbicular diorite from Corsica (corsite) thumb|upright=1.7|QAPF diagram with dioritoid fields highlighted in yellow and diorite in red thumb|upright=1.4|Mineral assemblage of igneous rocks
Diorite ( ) is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite.