What characterizes Diorite in terms of its mineral content?

Diorite is characterized by its coarse grain texture and a relatively uniform composition of plagioclase feldspar, typically with lesser amounts of other minerals such as biotite, hornblende, and possibly some quartz. This coarse-grained texture means that the individual crystal grains within the rock are large enough to be seen without a microscope, reflecting the slower crystallization of magma beneath the Earth's surface. The equal composition of plagioclase refers to the presence of both sodium-rich and calcium-rich varieties, which is a defining feature of diorite.

This mineral composition distinguishes diorite from other igneous rocks, such as basalt, which has a fine texture and is predominantly rich in mafic minerals, or granite, which is largely quartz and feldspar. Other options presented, such as high glass content and fine texture, do not apply to diorite, as it lacks the glassy characteristics found in volcanic rocks and has a distinctly coarse texture. Similarly, while diorite can have dark minerals, it is not characterized by a dark coloration from olivine, which is more typical of mafic rocks like basalt or gabbro.