Otta Slate: complete guide
Otta Slate is a dark grey-green Norwegian schistose stone, with a naturally undulating surface and micaceous glints. It is chosen for floors, roofing and cladding with a rustic Nordic character.
History and origin
It comes from Norway, where schistose stones have been used for centuries for roofs, floors and walls in traditional buildings. Commercially it is classed as slate, although geologically it belongs to the schistose rocks such as phyllites. Today it is also valued in contemporary indoor and outdoor design. Marmi di Carrara supplies it on request.
Look and veining
The background is dark grey-green with silvery glints due to mica, sometimes with small rust-coloured spots or specks. The natural riven surface is undulating and irregular, and changes from slab to slab. Honed or brushed, it becomes more uniform and deeper, while retaining a slight mineral sheen.
Technical properties (indicative)
| Classification | schistose metamorphic rock (commercial slate) |
|---|---|
| Density | approx. 2,800 kg/m³ (indicative) |
| Mohs hardness | approx. 3-4 |
| Water absorption | very low |
| Main use | indoor and outdoor |
| Acid resistance | good; frost-resistant |
Recommended uses
It is suitable for indoor and outdoor floors, roofing, wall and façade cladding, stairs and bathrooms. Natural riven is excellent for non-slip outdoor areas; for kitchen worktops honed slabs are preferred.
Care and maintenance
Clean with water and neutral detergents. A specific slate impregnator protects against stains and revives the colour, particularly useful on honed surfaces.
Pairings
- Nordic pine or birch
- black steel
- wool, felt and neutral tones
FAQ
Is it a true slate?
Commercially yes; geologically it is a schistose metamorphic rock. In practice it offers the same qualities: low porosity, frost resistance and ease of splitting.
Are the rust specks a defect?
They are a natural characteristic of this stone; those wanting a more uniform surface can request a selection of slabs.
Can it be used in a shower?
Yes, with a riven or brushed finish it is suitable for shower floors and walls thanks to its low porosity.
How do I order it?
On request: send us the dimensions and finish and we will send you a quotation with photos of the slabs.
Ardesia Otta: available on request
We supply this stone as blocks, slabs, tiles and custom-made pieces. Tell us size, thickness and quantity: we will send photos of the available slabs and a quote within 24 hours.
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