| Drilling showed that the troctolite body is 330 metres thick and is underlain by foliated leuconorite to norite and massive anorthosite. |
| In New York the emery deposits are segregations of aluminum and iron oxides in norite. |
| The basement is mainly composed of quartz biotite norite and minor serpentinite which belong to the Ordovician Boganclough intrusion. |
| Ore hosted in a norite body within a large unexplored anorthosite complex. |
| Near the ores there are likely to be granitic rocks, which, like the ores, seem to be segregations from the norite magma. |
| Enstatite occurs in plutonic basic and ultrabasic rocks such as peridotite and norite, and also in some high-grade metamorphic rocks. |
