Portoro Extra differs from the classic for its largest and most pronounced grain; It is a very precious stone with deep black background and gold colored veins. The extraction area is La Spezia and more precisely in Portovenere. Marmo Portoro is a stone of great character and beauty, its originality and elegance make it suitable for precious finishes and complement of modern and ornamental furnishings such as fireplaces, columns, sculptures and luxurious tops.


Quarrying Location: Italy
Availability: Limitata
Compression breaking load: 1862 kg/cm2
Compression breaking load after freezing: 1597 kg/cm2
Ultimate tensile strength: 104 kg/cm2
Thermal linear expansion coefficient: 0,0050 mm/m°C
Water absorption: 0,74%
Impact test: min. fall height: 25 cm
Frictional wear test: -
Bulk density: 2712 kg/m3