marble, granite, gneiss, countertops, waal and floor, building ornaments, stairs
marble, granite, gneiss, countertops, waal and floor, building ornaments, stairs
Beola Grigia Gneiss - Beola Grigia Servezzo Gneiss
Also called Beola Grigia Classica. Denomination according to UNI EN 12440: Beola Grigia dell'Ossola. Smooth gray-colored Ortogneiss, medium-fine grained (greater than the Beola Ghiandonata), homogeneous; equigene foliate weaving and rare mineralogical lineation. The mica have a medium grain and are present in thin discontinuous levels, with regular millimeter spacing. Mineralogical composition: quartz, K-feldspar (microcline), plagioclase, biotite and muscovite in approximately equal proportions, rare chlorite and epidote.
Extraction area
1 - "Piodale" quarry Tronto (VB) 2 - locality Scarepi, Trontano (VB)
Geological location
1 - Fobello-Rimella schist (Austroalpino) 2 - Monte Rosa fissure (Upper Pennidico) 3 - Orselina-Moncucco-Isorno area (Upper Pennida)
Prevailing uses
civil construction
industrial building
Street furniture
interior design
funerary art