what texture is diorite
Diorite Gneiss. Diorite is a crystalline igneous rock that exhibits a granular texture and is sometimes alternatively referred to as black granite. The rock is primarily comprised of plagioclase feldspar, but generally contains smaller amounts of biotite, hornblende, or other dark-colored minerals as well.iorite gneiss chiefly consists of sodium-rich plagioclase feldspar, quartz, and hornblende, as well as minor amounts of biotite, sphene, or other accessory minerals.