A coarse-grained plutonic rock similar to gabbro but containing hypersthene.
- Coeval gabbro intrusions are composed of unlayered, fine- to medium-grained, biotite-bearing norite, gabbronorite, gabbro and diorite.
- Enstatite occurs in plutonic basic and ultrabasic rocks such as peridotite and norite, and also in some high-grade metamorphic rocks.
- The basement is mainly composed of quartz biotite norite and minor serpentinite which belong to the Ordovician Boganclough intrusion.
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