R10
0.2%
6.21 kg CO₂-EQ
35.8 MPa
A brushed and completely smooth surface with a distinct variation of natural character and light tones.
The slate is extracted from Sæterfjellet, 18 km south of Oppdal. A deeper brushing process enhances the minerals in the stone, giving it a distinct and unique character. At the same time, the completely smooth surface makes it easy to clean without compromising the excellent slip resistance. Brushing and further customization of size and thickness are done locally at the quarry, ensuring consistent quality and a minimal climate footprint.
| min – max (mm) | min – max (mm) | min – max (mm) | |
| Length | Width | Thickness | |
| Rectangular, random lengths | 300 – 2500 | 100 – 600 | 10 – 50 |
| Rectangular, fixed lengths | 300 – 2500 | 100 – 600 | 10 – 50 |
| Square | 100 – 600 | 100 – 600 | 10 – 50 |
| Sawn | |
| Brushed | |
| Honed |
| Tiles for walls and floors (indoor) | |
| Paving tiles (outdoor paving) | |
| Outdoor tiles | |
| Outdoor tiles for pedestal system floors | |
| Stair treads | |
| Countertops and slabs | |
| Facade panels | |
| Window sills |
| mm | |
| Thickness/depth | |
| Indoor floor/wall | 8 – 20 |
| Pedestal flooring indoor/outdoor | 20 – 25 |
| Outdoor paving (glued) | |
| Pedestrian traffic | 10 – 20 |
| Facade panels | 8 – 35 |
| Glued to steel/aluminium profiles | 8 – 12 |
| Slate overlap with screws or hooks on steel/aluminium/wood battens | 8 – 12 |
| Mechanically fastened on backside to profiles | 22 – 25 |
| Mechanically fastened with dowels in slate edge to profiles | 35 |
| Thickness [mm] | Weight per m² [kg] |
| 10 | 27 |
| 12 | 33 |
| 15 | 40,5 |
| 20 | 55 |
| 25 | 67,5 |
| 30 | 81 |
| 40 | 108 |
| 50 | 135 |
| 60 | 162 |
| Density | 2730 g/m3 |
| Water absorption [% by weight] | 0,2 |
| Flexural strength [MPa] | 35,8 |
| Slip resistance | R10 |
| CO₂ emissions [eq. per m², t: 10 mm] | 6,21 |
| The mineral composition affects the slate’s technical properties, workability, and visual expression. Light Oppdal quartzite is a metamorphic slate primarily composed of quartz-rich minerals with a low content of porous components. The table below lists the most common minerals in the stone and their impact on material properties. | |
| Quartz | 46% |
| Provides high abrasion and compressive strength. Contributes to low water absorption and high mechanical resistance. | |
| Mica | 34% |
| Mainly muscovite and biotite. Affects the slate’s cleavage and surface texture. Can create visual shimmer effects. | |
| Feldspar | 12% |
| Affects color expression and surface variation. Has good chemical resistance. | |
| Epidote | 6% |
| Occurs in small amounts. Minimal impact on structure, no effect on color or technical performance. | |
| Titanite | 2% |
| Occurs in small amounts and has no measurable impact on technical properties. |
| Petrography | |
| Quartzite slate | |
| Origin | |
| Oppdal, Norway | |
| Descriptions of the material for facades and floors, indoors and outdoors: | |
| Light grey cleavable quartzite slate in natural layers, giving a matte surface with a natural color variation similar to Light Oppdal Restfonna with silk brushed finish. The expression is achieved through a multi-step planing and brushing technique using different tool grits. | |
| Cleavable natural stone with distinct layers or zones in varying colors | |
| A variation in shades from tile to tile (or slate brick to slate brick) | |
| A mix of light and dark grey shades in lines, waves or stripes on a single tile/brick and variation across tiles/bricks | |
| Possibility for unique split (hewn) edges that offer relatively precise but naturally rough and rustic appearance | |
| Flexural strength over 35 MPa | |
| Water absorption max 0.2% | |
| Slip resistance minimum R10 | |
| Durable and long-lasting | |
| Long-term delivery reliability and documentation requirements: | |
| EPD for life cycle assessments, CO₂ calculations | |
| Track record showing long-term retention of technical properties despite patina development | |
| Reuse potential (as long as functional descriptions allow) | |
| Long-term maintenance plans | |
| Future access to the same visual and technical qualities | |
| Established routines for testing and quality control | |
| CE marked | |
| Reference projects | |
| Access to technical support and advisor | |
| Other material requirements: | |
| Must be a natural material | |
| Material should reflect the project’s history and/or location | |
| See also reference projects for the desired expression |
Place of origin Oppdal, Norway Petrography Quartzite slate
Light Oppdal Restfonna silk brushed finish: Light grey cleavable quartzite slate in natural layering, with a matte surface and natural variation resembling Light Oppdal Restfonna with a silk brushed finish. The look is achieved through a multi-step brushing process with different tool grits.
We offer architects material samples, advice and inspiration for projects of all sizes. Explore our full product range, visit the quarry, or book a tailored presentation – either in person or online. Together we’ll find the best solution for your project.
See how we can support your project
We are sorry, but you are using a version of Internet Explorer that is not supported on this site. The browser is no longer updated by Microsoft and may therefore pose a security risk. We recommend that you use a different browser. Welcome back!
