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diorite |
Also found in: Wikipedia, Hutchinson | 0.01 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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| All five holes of the program have been completed and have confirmed that mineralization, including visible gold in some holes, occurs in association with stockwork-type quartz sulphide veining within albitized diorites developed along north-south trending structural corridors. In total 1,641m in 12 RC holes tested for extensions to known mineralized diorites and infilled areas within the inferred resource. The porphyritic diorites are potassically altered with variable development of quartz veining and associated malachite, azurite, cuprite, pitch limonite and native copper mineralization and persisted to hole end at 500 metres depth. |
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