Diorite
Diorite ( /ˈdaɪ.əˌraɪt/) is an melted rock that has cooled made mostly of the silicate minerals (materials made of silicon and oxygen). Diorite is in between that of basalt and granite. Diorite is usually grey to dark-grey in color, but it can also be black or bluish-grey, and often has a greenish cast. It is distinguished from gabbro (basalt) because the materials in diorite has more sodium and less calcium. Diorite may have small amounts of quartz, microcline, and olivine. Tiny amounts of muscovite may also be found.  If there is a lot of quartz it makes the rock type quartz-diorite (>5% quartz) or tonalite (>20% quartz).