Description:

This rock is dark grey, medium grained, compact and with irregular fracture. It is classified as a quartz monzonite-diorite with biotite and amphibole. There are still large reserves of this granite. It has a great abundance of ferromagnesian elements, which imbue it with its dark colour. Can be used both for exteriors and interiors.

Origin:

Portugal

Physical-mechanical characteristics:

Density: 2.841 g/cm ≥
Absorption coefficient: 0.14%
Compressive strength: 1660 kg/cm2
Tensile strength: 226 kg/cm2
Wear resistance: 0.5 mm
Impact strength: 80 cm
Freezing test coefficient: 0%