Mangerite is generally whitish in altered surface and green in fresh exposure. It is characterized by a porphyraceous texture with K-feldspar and plagioclase phenocrystals in a medium to coarse-grained matrix consisting of quartz, amphibole, biotite, orthopyroxene and magnetite. The proportion of feldspar phenocrystals ranges from 20% to 30% of the rock and their length is generally between 1 and 4 cm. Phenocrystals consist mostly of perthitic K-feldspar. Orthopyroxene is observed in ferromagnesian mineral clusters and is partially replaced by biotite and amphibole. Quartz content is variable, but generally relatively low. Quartz forms large zones having undulatory extinction. Magnetite is almost systematically present in mangerite, but its content is highly variable. Mangerite also contains euhedral crystals of magmatic epidote associated with accessory minerals such as apatite and zircon.

The mangerite texture is marked by mild to moderate foliation. At the border of the intrusion, this foliation is generally better developed and the rock is finer grained and phenocrystals display stronger alignement. The apparent increase in strain intensity towards the edge of the intrusion coincides with an increase in magnetic susceptibility.

Syenite is whitish in altered surface and pinkish in fresh exposure. It is mainly k-feldspar porphyraceous and massive. It shows the same mineralogy as mangerite, but with different proportions of the various mineral phases. Plagioclase is altered to white mica and K-feldspar is generally perthitic. When present, orthopyroxene appears uralitized. It shows a rim consisting of green hornblende, locally chloritized. These ferromagnesian minerals and biotite form millimetric grain clusters. Syenite locally contains quartz which forms large zones of undulatory extinction associated with myrmekite grains. Accessory mineral phases are magmatic epidote, opaque minerals (including magnetite), apatite and zircon.

Alkali feldspar granite is medium grained, pink in fresh exposure, pink-brown in altered patina and marked by magmatic foliation. Locally, the rock is deformed and finer grained. This granite contains varying amounts of biotite, orthopyroxene and magnetite. K-feldspar (microcline) is usually perthitic. Biotite and green hornblende are mainly observed as grain clusters. Epidote, apatite and zircon are present as accessory minerals, along with opaque minerals (magnetite, pyrite).