Dioritoid
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About Dioritoid
A field term for coarse-grained crystalline normal igneous rocks with <90% mafic minerals and the felsic minerals containing <20% quartz, <10% felspathoids and plagioclase being >65% of total feldspars. The plagioclase is sodium rich, in contrast to gabbroids, which have calcium rich plagioclase. The group includes diorite, quartz diorite, quartz monzodiorite, foid- bearing diorite, foid- bearing monzodiorite and monzodiorite.
Classification of Dioritoid
float='left'>Dioritic rocks are in sections 9,9*,9’,10,10* and 10' of the QAPF diagram.
Sub-divisions of Dioritoid
Mineralogy of Dioritoid
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase | A petrological term for Albite-Anorthite Series. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | An informal name for dark green to black amphiboles, mostly ferro-hornblende or ... |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
Synonyms of Dioritoid
Internet Links for Dioritoid
mindat.org URL:
https://www.mindat.org/min-48224.html
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Durham Region, Ontario, Canada