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syenite

Syllabification: sy·e·nite
Pronunciation: /ˈsīəˌnīt
 
/

Definition of syenite in English:

noun

Geology
A coarse-grained gray igneous rock composed mainly of alkali feldspar and ferromagnesian minerals such as hornblende.
Example sentences
  • The southern Zomba area consists mainly of syenite surrounded by a periphery of alkaline granite.
  • A violet, coarse-grained, porphyritic quartz syenite, which makes up large parts of the pluton, was collected for dating.
  • The selective removal of these minerals resulted in a change of the composition of the magma to one near that of the rock syenite.

Origin

late 18th century: from French syénite, from Latin Syenites (lapis) '(stone) of Syene' (from Greek Suēnē 'Aswan', a town in Egypt).

Derivatives

syenitic

1
Pronunciation: /ˌsīəˈnitik/
adjective
Example sentences
  • Of far less importance are occurrences in gneisses and amphibolites, in small plutons derived from syenitic and gabbroic magmas, and in certain contact-metamorphic rocks.
  • In the central part of the intrusion, some small granitic aplite dykes intrude the syenitic rocks.
  • Several pools of syenitic magma were separated from the main body of the melt.

Definition of syenite in:

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