| The intermediate zone consists of massive lilac-gray sodalite with inclusions of nepheline, dark green aegirine, and pale green fluorapatite. |
| It is a pale gray to beige colored rock by comparison with the more common nepheline syenite, which is uniformly dark gray. |
| These last consist of an intermixture of nepheline or sodalite and alkali-felspar. |
| Finally, the eastern side of the mountain is mostly peralkaline nepheline syenites and porphyrites. |
| Familiar examples include nepheline, leucite, and members of the sodalite and cancrinite groups. |
| It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre. |
