Bulgarian gneiss

الوصف

flooring thickness 2,**4cm; revetment thickness  1,**2,5cm
They are extremely tough and coldsteady
The gneiss has various colours -silver-grey, beige and Panther.

 Gneissic rocks are usually medium- to coarse-foliated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc. Depending on their composition, they may also be called garnet gneiss, biotite gneiss, albite gneiss, etc.

Gneiss displays compositional banding where the minerals are arranged into bands of more mafic minerals and more felsic minerals. This is developed under high temperature and pressure conditions.