About two to five.
Marble Rocks range from 4 to 5 on the Mohs scale
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
Corian is not specifically rated on the Mohs scale of hardness as it is a type of solid surface material made from acrylic and natural minerals. However, it generally has a hardness similar to natural stone such as granite or marble, which typically fall in the 6-7 range on the Mohs scale.
It's called the Ore
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
The hardness is 3-4 on Mohs scale.
Nickel has a hardness of 4 on the Mohs scale.
The Mohs scale is used to determine the relative hardness of minerals.
Traventine is one of the softer stones. On the MOHS scale it varies between 2.5 to 3.5, hence making it softer than Granite and Quartz surfaces. If we have to compare Travetine with Marble hardness, then both are almost the same, although Travetine is being used for outdoor wall cladding more frequently than Marble. This is probably because Travetine takes more time to fade away in the Hot summer sun when compared to Marble