Definition of diorite in English:

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Pronunciation: /ˈdʌɪərʌɪt/


[mass noun] Geology
A speckled, coarse-grained igneous rock consisting essentially of plagioclase, feldspar, and hornblende or other mafic minerals.
Example sentences
  • The thrust sheet overlying the Delaney Dome Formation is composed of the basic Ballyconneely Amphibolite and interbanded quartz diorite and hornblende gneiss that intrude the Dalradian sediments.
  • It is dominated by variably foliated, medium-grained, even-textured to porphyritic biotite hornblende tonalite and quartz diorite.
  • The clasts range from angular to subrounded and show a weak preferred orientation when elongate; they include micaceous siltstone, fine-grained sandstone, tuffaceous rock, andesite and medium-grained diorite.



Pronunciation: /dʌɪəˈrɪtɪk/
Example sentences
  • Like the Kevins Dam suite, these granites may also be derived from melting of quartz dioritic to tonalitic rocks.
  • A dioritic pod in varitextured gabbro was sampled for U-Pb age determination.
  • Numerous undated granitic and dioritic plutons intrude the Palaeozoic rocks and form large areas of Karlik Tagh and Barkol Tagh.


Early 19th century: coined in French, formed irregularly from Greek diorizein 'distinguish' + -ite1.

For editors and proofreaders

Line breaks: di¦or|ite

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