All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite. |
These microfaults are commonly pulled apart with growth of new quartz and biotite between pulled apart feldspar and hornblende. |
In most of the intrusion, hornblende and biotite are both present, but occasionally either may constitute the sole mafic phase. |
The pegmatites are composed of K-feldspar, quartz, plagioclase and biotite, with titanite, opaque minerals and apatite as accessory minerals. |
Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite. |
The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation. |