This granulite consists of garnet, biotite, muscovite , quartz, plagioclase and cordierite.
All monazite grains are located in the rock matrix, which consists of quartz, muscovite , biotite, epidote, chlorite, plagioclase, potassium feldspar and garnet with a granoblastic texture.
The intervening host-rock layers are between 2 and 5 cm thick, being composed of biotite, sillimanite, garnet, muscovite , quartz and plagioclase.
They collected several pegmatite pockets in which topaz was associated with both clear and smoky quartz, microcline, albite, muscovite , fluorite, and cassiterite.
Although biotite is capable of this, other minerals such as muscovite , garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.