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Syenite

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Name:
Its name is derived from Syene, Egypt. A.G. Werner in 1788 applied the name in its present meaning; the Egyptian rock is a granite containing much quartz.
A granitoid having an alkali-feldspar/plagioclase ratio from 65-90% and <5% quartz.

A group of plutonic rocks containing alkali feldspar (usually orthoclase, microcline, or perthite), a small amount of plagioclase (less than in 'monzonite'), one or more mafic minerals (esp. hornblende), and quartz, if present, only as an accessory; also, any rock in that group; the intrusive equivalent of 'trachyte.' With an increase in the quartz content, syenite grades into 'granite.'


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Classification of SyeniteHide

Sub-divisions of SyeniteHide

Mineralogy of SyeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.

Age informationHide

Age range:
Paleoproterozoic to Permian : 1740 Ma to 261 ± 6 Ma - based on mindat.org data.

Internet Links for SyeniteHide

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