Negro Gv
Description
This is a dark grey, medium-grained, compact, irregularly fractured rock. It is classified as diorite quartz monzonite with biotite and amphibole and there are large reserves of it. It has an abundance of ferromagnesian elements, which give it its dark colour. It can be used both outdoors and indoors.
Origin
Portugal
Physical-mechanical characteristics:
Volumetric mass: 2,841 grs/cm≥
Absorption co-efficient 0.14%
Mechanical compressive strength: 1660 kg/cm2
Mechanical bending strength: 226 kg/cm2
Resistance to wear: 0.5 mm.
Impact strength: 80 cm.
Resistance to frost: 0%
