Mangerite is whitish to brownish in altered patina and greenish in fresh exposure. It is porphyritic, locally megacristic, with 1-5 cm long K-feldspar and plagioclase phenocrystals. These phenocrystals, which can represent up to 30% of the rock, have a weak preferential orientation. In addition, the poorly developed preferential alignment of ferromagnesian minerals shows a weak foliation. K-feldspar is generally perthitic and locally rimmed by whitish plagioclase (rapakivi texture). Quartz and feldspar form myrmekites in places. The rock is also composed of altered orthopyroxene, quartz, green hornblende, biotite with apatite inclusions, zircon, epidote and opaque minerals (magnetite and pyrrhotite).

At the outcrop scale, variation in K-feldspar content can usually be observed, reflecting the gradual shift of mangerite to syenite. The latter is brownish to pink in altered surface and pink in fresh exposure, massive and generally K-feldspar porphyritic. It can contain crystals of orthopyroxene, magnetite and, in smaller amounts, biotite.

Orthopyroxene monzodiorite is greyish in fresh exposure, fine to coarse grained and generally foliated to gneissic. In thin section, it displays large millimetric orthopyroxene crystals, usually altered into a white mica-carbonate-chlorite assemblage. Quartz has an undulatory extinction and magnetite occurs either as disseminated crystals in the rock or as inclusions in brown-red biotite. K-feldspar is perthitic, while plagioclase polysynthetic twinning pinches out.

Syenogranite is pink-grey in altered patina, pink in fresh exposure, coarse grained and K-feldspar porphyritic. In thin section, the latter is usually perthitic and associated with large quartz zones with undulatory extinction. These two minerals also form myrmekites. Ferromagnesian minerals do not exceed 3% of the rock and consist of green hornblende and biotite. Epidote, apatite and zircon are the accessory minerals. In general, the rock does not show evidence of deformation to the naked eye, but quartz grains locally show a slight preferential flattening that marks a poorly developed foliation.