Diorite - MSN Encarta

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Diorite - Wikipedia, the free encyclopedia
Diorite (pronounced /ˈdaɪəraɪt/) is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), biotite ...
Hornblende Diorite
Hornblende Diorite. There are three types of hornblende diorite. Type A.: course-grained, patchy, black and white rock. 60 % white plagioclase, 40 % black hornblende in ...
Definition: diorite from Online Medical Dictionary
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Diorite, name given to several closely related igneous rocks, usually grey or dark grey in colour. The rocks are crystalline, coarsely granular, and composed mostly of silica and alumina, with some iron oxides, lime, and magnesia. The most common species of diorite contain plagioclase feldspar and hornblende. Other diorites contain biotite, quartz, or various ferromagnesian silicates.