Kolmården Marble
Kolmården Marble was formed approximately two billion years ago and is recognized as one of the hardest marbles in the world. It has been quarried since the late 17th century.
This unique marble is prized for its green shades, decorative veining, and exceptional durability, making it both an attractive and environmentally friendly natural material. For these reasons, it holds the status of one of the world’s most exclusive marbles.
At our quarry in Oxåker, we extract two types of Kolmård marble: Kolmården OXL and Kolmården OX. The difference in their veining is determined by the direction in which the stone is sawn.
Kolmården Marble has been used in renowned buildings, including Stockholm City Hall, the Paris Opera, and Rockefeller Center in New York. Since 2018, it has also been classified as a geological World Heritage Site (Global Heritage Stone).
Kolmården Marble OXL
Kolmården Marble OX
Technical characteristics
| Features | Type of value | Declared value – Kolmården Marble | Unit | Standard |
|---|---|---|---|---|
| Density | Average | 2750 | kg/m3 | EN 1936 |
| Porosity | Average | 0,1 | % | EN 1936 |
| Frost resistance | Ultrasound speed, change | -0.004 | % | EN 12371 |
| Weight change | -0.01 | % | EN 12371 | |
| Flexural strength, change | 3.3 | % | EN 12371 | |
| Bending strength (3-point load) | Lowest expected value | 9,8 | MPa | EN 12372 |
| Average | 16,7 | MPa | EN 12372 | |
| Standard deviation | 3,6 | MPa | EN 12372 | |
| Breaking load stud hole/split | Violation load | 2730 | N | EN 13364 |
| Edge distance (d1) | 22.5 | mm | EN 13364 | |
| Breaking width (dA) | 50.1 | mm | EN 13364 | |
| Water absorption | 0.04 | % | EN 13755 | |
| Impact strength | 5 | J | EN 14158 | |
| Slip resistance, sanded surface (dry) | Sanded (dry) | 50 | SRV | EN 14231 |
| Sanded (wet) | 19 | SRV | EN 14231 |