| In a basal flow in Moraine Park, the slaggy and compact phases show differences in phenocrysts as well as in groundmass. |
| These lavas have groundmass textures that vary from almost holo-crystalline to glassy. |
| The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet. |
| The groundmass consists mainly of bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite. |
| The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite. |
| The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent. |
