Is serpentinite rock extrusive or intrusive?

Syenite - Wikipedia, the free encyclopedia

Syenite is a coarse-grained intrusive igneous rockof the same general composition as granite but with the quartz either absent or present in relatively small amounts (<5%). The feldspar component of syenite is predominantly alkaline in character (usually orthoclase) . Plagioclase feldspars may...

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en.wikipedia.org/wiki/Syeniteen.wikipedia.org/wiki/Syenite