Is Phonolite a Rock?

Phonolite, any member of a group of extrusive igneous rocks (lavas) that are rich in nepheline

and potash feldspar. The typical phonolite is a fine-grained, compact igneous rock that splits into thin, tough plates which make a ringing sound when struck by a hammer, hence the rock's name.

Is Phonolite intrusive rock?

Phonolite is an uncommon extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to porphyritic (mixed fine- and coarse-grained). Its intrusive equivalent is nepheline syenite.

What type of rock is Phonolite porphyry?

Phonolite porphyry is an igneous rock, meaning it was formed as magma or lava cooled.