Monte Rosa

Monte Rosa is a classic Italian gneiss from the Ossola valley in Piedmont (Antronapiana / Villadossola) — Palaeozoic metamorphic, with a silver-grey and white ground mass, pronounced black mica streaks and characteristic white feldspar eye structures. Also traded internationally as Serizzo Monte Rosa, Serizzo Ghiandonato, Beola Ghiandonata Grande Fiore, Silver Waves Granite and Monterosa Granite; used for external façades, paving, stairs, window sills, skirtings, structural applications with an Alpine feel and prestige floors.

Monte Rosa ist petrographisch ein Gneis (DNSA Stein 605) — ein metamorphes Gestein mit foliierter Mineralstruktur und charakteristischen weißen Feldspat-'Augen' in einer dunklen Glimmer-Matrix. Im internationalen Handel wird der Stein traditionell als 'Granit' geführt, weil er in Verarbeitung und mechanischen Eigenschaften wie ein klassischer Hartstein gehandhabt wird. Bei ROSSITTIS klassifizieren wir Monte Rosa handelsüblich in der Granit-Familie gemäß weit verbreiteter Trade-Konvention für italienische Beola/Serizzo-Gneise.

Gneiss Italy Frostbeständig Säurebeständig 2.657 kg/m³

Available as: Slabs, Skirting

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About Monte Rosa

Monte Rosa shows an exceptionally characterful Alpine slab character with the classic foliated gneiss structure. The ground mass consists of a silver-grey and white matrix with many white, egg-shaped to elongated feldspar 'eyes' (plagioclase and potassium feldspar domains — the 'Ghiandonata' structures that give the stone its name), embedded in a dark mica matrix with black biotite and muscovite streaks. The foliation (mineral alignment through tectonic compression) is clearly recognisable but not strictly linear — the black mica streaks run in irregular waves and curves around the pale feldspar eyes, which gives the stone its characteristic 'Silver Waves' feel (hence the international trade name Silver Waves Granite). The eye structures formed during metamorphism through the tectonic squeezing-out of feldspar crystals from the original granite protolith. The overall material effect is lively, Alpine and classic — the stone reads like a mountain landscape set in stone, with flowing snowfields and dark rock structures. On a polished surface the stone develops a silky depth with a restrained gloss; the pale feldspar eyes shimmer white and contrast with the dark mica bands. On a flamed surface, the Alpine structural effect emerges more clearly to the touch.

Geologically, Monte Rosa is a Palaeozoic metamorphic gneiss from the Ossola valley in the Italian province of Piedmont. The quarries lie specifically in the region around Antronapiana and Villadossola, both small mountain settlements in the upper Ossola valley near the Swiss border. The region has been among the most tradition-rich building stone provinces of Italy since antiquity — the famous structural gneiss 'Serizzo' has been quarried here for over 2,000 years and used, among other places, in Milan Cathedral, in many Renaissance buildings and in numerous building stone projects of the northern Italian Alps. Petrographically the stone is a well-foliated gneiss with the characteristic 'Ghiandonata' eye structures that distinguish it from finer-grained Serizzo grades. The DNSA natural building stone database lists the material under identifier Stein 605 with complete technical data. Several synonyms circulate in international trade: Serizzo Monte Rosa (the main Italian designation), Serizzo Ghiandonato (alluding to the eye structure), Beola Ghiandonata Grande Fiore ('great flowers' — referring to the pronounced feldspar eyes), Silver Waves Granite and Monterosa Granite.

Technically, Monte Rosa shows solid values for an Italian gneiss: bulk density 2,657 kg/m³, compressive strength 169.4 MPa, compressive strength after frost 161.8 MPa (4.5 % loss — very good frost resistance confirmed), flexural strength 12.1 MPa, water absorption 0.305 %, linear thermal expansion 0.61 mm/m/100K, abrasion resistance 0.76 (Italian standard), Mohs hardness 6–7. According to DNSA the stone is expressly frost- and acid-resistant, and polished surfaces are durable outdoors as well (polish durable outdoors). Monte Rosa is therefore fully fit for everyday use in the most demanding interior and exterior applications, including external façades with retained polished gloss.

At ROSSITTIS we carry Monte Rosa as an unsized slab in 10, 30 and 61 mm thickness (from standard tiles through wall and floor slabs to solid applications such as steps or bar counters), in tiles for floor and wall applications, as a skirting and for project-specific cutting. Also available as tread and riser for stairs, window sill, paving stone and kerbstone. The surface finishes currently held in stock are listed in the »Finishes« block further down.

Compared with related Serizzo grades from the same Ossola valley, Monte Rosa brings the most pronounced eye structure ('Ghiandonata Grande Fiore' = great flowers): Serizzo Antigorio is more even, with a finer mineral distribution; Serizzo Sempione is somewhat darker and more consistently grey; Beola Bianca is lighter and with fewer eyes. Compared with the Swiss Onsernone gneiss (Ticino gneiss) or Vals quartzite (Grisons), Monte Rosa brings the typical Italian Beola eye appearance with a powerful Alpine character. For architectural projects with an Alpine, traditional or prestige feel — external façades in the Alpine region, public buildings in northern Italy and Switzerland, structural applications with a historic character, paving in old town centres, stairs with a powerful material feel and interior surfaces with Alpine elegance — Monte Rosa is a tradition-rich and expressive choice. The stone is one of the classic 'workhorses' of the northern Italian building stone industry — proven for centuries, with excellent block-to-block consistency and dependable availability for planning.

Technical data

Guide values for the stone type, taken from manufacturer and test reports. Natural stone is a natural product — individual batches and slabs can differ. For critical applications, request slab-specific test data.

Rohdichte 2.657 kg/m³

Druckfestigkeit 169,4 MPa

Biegezugfestigkeit 12,1 MPa

Wasseraufnahme 0,31 %

Frostbeständig Ja

Säurebeständig Ja

Suitability by application

Finishes

Monte Rosa is available in a range of finishes. The finish affects appearance, feel and the care it needs.

Poliert

Politur ist die klassischste Veredelung im Hartgesteinsegment — eine spiegelglatte, hochglänzende Oberfläche mit höchstmöglicher Farbintensität und maximaler Tiefenwirkung der Mineralstruktur. Als säurebeständiges Silikatgestein ist polierter Granit pflegeleicht und für Küchenarbeitsplatten, Wandverkleidungen und repräsentative Sichtflächen erste Wahl.

Geflammt + 1 x gebürstet

Die Oberfläche wird durch Hitze aufgeraut und einmal gebürstet, um scharfkantige Mineralreste zu glätten und loses Material zu entfernen. Etwas sanftere Haptik als rein geflammt, weiterhin rutschhemmend, Farbe weniger intensiv als poliert. Standardwahl für Außenbereiche, Terrassen und stark beanspruchte Bodenflächen.

Care & fabrication

As an Italian gneiss, Monte Rosa is a robust hard stone with low water absorption (0.305 %), DNSA-confirmed frost resistance (4.5 % loss of strength after frost) and full acid resistance. Wine, lemon juice, vinegar, cola, bathroom cleaners or descalers leave no etch marks as they would on marble or limestone — the stone is markedly easier to look after and ideally suited to intensive everyday use.

For interior applications we recommend a silane- or polysiloxane-based sealer at first installation. On polished surfaces, refreshing every 8–10 years is sufficient; on heavily used floors, stairs or external applications we recommend a check every 3–5 years. Sealing protects against deep penetration by oil, grease and pigments — on the heterogeneous eye-gneiss structure, discolouration can otherwise show up particularly on the paler feldspar areas.

Daily care is carried out with a pH-neutral natural stone cleaner and a soft cloth or microfibre mop. Clear warm water is usually sufficient. Acidic cleaners are in principle unproblematic, but should nevertheless not be used, because they can attack the sealer. Outdoors, dirt, moss and de-icing salt residues should be removed regularly — if neglected for longer periods, the foliated mineral structure can hold dirt or moss in the fine mica lines.

For kitchen worktops, Monte Rosa is solidly suitable: cut- and scratch-resistant, not sensitive to heat (hot pots and pans can be set down directly for short periods, though longer heat exposure above 200 °C should still be avoided), acid-resistant and with good stain repellency. The heterogeneous eye-gneiss surface does, however, develop a subtle patina over time in heavily used kitchens because of the fine mica foliation, which some buyers value as a deliberate stylistic element and others regard as a disadvantage — an honest set of expectations is sensible.

For external applications, Monte Rosa is particularly well qualified: the DIN/EN-confirmed values (compressive strength after frost 161.8 MPa) and above all the durable external polishability make the stone the first choice for demanding external façades with retained gloss. Polished external surfaces keep their brilliance for years. For classic building stone applications in Alpine climate zones (paving, stairs, kerbstones, façades), Monte Rosa has been proven for centuries — many northern Italian town centres and structures consist of Serizzo/Beola gneiss.

For pool surrounds, external terraces and fountain surrounds, a slip-resistant textured finish is mandatory — on smooth external surfaces there is a high risk of slipping when wet. In areas with frequent salt contact (de-icing salt, pool chlorine) we recommend an additional refresh of the sealer every 2–3 years. The foliated mineral structure reacts somewhat more sensitively to de-icing salt than uniform granites — careful sealing in regions with winter service is advisable.

Frequently asked questions

What is Monte Rosa geologically?

Monte Rosa is a Palaeozoic metamorphic gneiss from the Ossola valley in the northern Italian province of Piedmont. Geologically a well-foliated augen gneiss with characteristic white feldspar 'eyes' in a dark mica matrix. DNSA lists the material under Stein 605. In international trade the stone is traded as a granite; at ROSSITTIS we classify it, as is customary in the trade, within the granite family in accordance with the trade convention for Italian Beola/Serizzo gneisses.

What synonyms are there for Monte Rosa?

In international trade, Monte Rosa also runs under the designations Serizzo Monte Rosa (the main Italian designation), Serizzo Ghiandonato, Beola Ghiandonata Grande Fiore (Italian for 'great flowers' — referring to the pronounced feldspar eyes), Silver Waves Granite and Monterosa Granite. 'Ghiandonata' means 'with eyes' and describes the typical feldspar eye structures that distinguish Monte Rosa from finer-grained Serizzo grades.

What technical values does Monte Rosa have?

Solid values: bulk density 2,657 kg/m³, compressive strength 169.4 MPa, compressive strength after frost 161.8 MPa (4.5 % loss = very good frost resistance), flexural strength 12.1 MPa, water absorption 0.305 %, abrasion resistance 0.76 (Italian standard), Mohs hardness 6–7. DNSA confirms frost and acid resistance and durable external polishability. These values qualify Monte Rosa fully for demanding interior and exterior applications, including prestige external façades with retained gloss.

What are the white eyes in Monte Rosa?

The white 'eyes' are egg-shaped to elongated feldspar domains (plagioclase and potassium feldspar) formed during metamorphism. From the original granite protolith, individual feldspar crystals were plastically deformed under tectonic compression and squeezed out into egg-shaped structures within the dark mica matrix. This 'augen gneiss' structure gives the Italian designation 'Ghiandonata' its name, as well as the international trade name 'Silver Waves'. The eye structures are a hallmark of the material and distinguish Monte Rosa from finer-grained Serizzo grades.

Which finishes are available for Monte Rosa?

The surface finishes currently held in stock are listed in the »Finishes« block on this page.

Is Monte Rosa suitable for a kitchen worktop?

Solidly suitable — with the typical hard stone properties: cut-, scratch- and heat-resistant, acid-resistant, low water absorption. The heterogeneous eye-gneiss surface disguises small marks of use astonishingly well. Important: in heavily used kitchens the foliated mica structure can develop a subtle patina over time, which some buyers value as a deliberate stylistic element and others regard as a disadvantage. For a quiet, classically Alpine kitchen worktop with a tradition-rich material character, Monte Rosa is a very fitting choice.

Is Monte Rosa suitable for historic and heritage conservation applications?

Outstandingly suitable — and that is in fact its principal historic application. Serizzo/Beola gneisses from the Ossola valley have been used for buildings for over 2,000 years — Milan Cathedral contains large quantities of Serizzo, as do many Renaissance buildings of northern Italy, numerous town walls, paving, stairs and bridges in the northern Italian Alps. For heritage restoration, historic and traditional structural applications and Alpine architecture with an established character, Monte Rosa is the authentic choice.

Where does Monte Rosa come from?

Monte Rosa comes from the Ossola valley in the Italian province of Piedmont, northern Italy — specifically from the quarries around Antronapiana and Villadossola in the upper Ossola valley near the Swiss border. The region has been among the most tradition-rich building stone provinces of Europe since antiquity and produces the classic Beola/Serizzo gneiss family. The designation 'Monte Rosa' refers to the nearby Monte Rosa massif, one of the highest Alpine peaks on the Italian-Swiss border.