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diorite |
Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson | 0.06 sec. |
dioriteMedium- to coarse-grained igneous rock that commonly is composed of about two-thirds plagioclase feldspar and one-third dark-coloured minerals, such as hornblende or biotite. Diorite has about the same structural properties as granite but, perhaps because of its darker colour and more limited supply, is rarely used as an ornamental building material. It is one of the dark gray stones that is sold commercially as “black granite.” diorite [′dī·ə‚rīt] (petrology) A phaneritic plutonic rock with granular texture composed largely of plagioclase feldspar with smaller amounts of dark-colored minerals; used occasionally as ornamental and building stone. Also known as black granite. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Offset dikes consist of a rock called quartz diorite that spread out from the Sudbury Basin like arteries. From 97m to 104m depth oxidized and strongly mineralized hydrothermal quartz-breccia and diorite porphyry was intersected underlain by a weakly mineralized, late-mineral diorite dyke to a depth of 211m. has identified Pele's Levack property as being a quartz diorite dike. |
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