The minerals that comprise the various iron ores have varied Mohs' hardness.
Hematite: 5.5-6.5
Magnetite: 5.5-6.5
Limonite: 4-5.5
Pyrite: 6-6.5
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
It is about 2.5 in the Mohs Hardness Scale.
Quartz has a hardness of 7 on the Mohs scale, making it relatively hard and durable.
What is Mohs hardness of Barium Sulfate
The hardness of the mineral pyrite, or Fool's Gold, is about 6 on the Mohs hardness scale. That's a little harder than a steel knife blade, but not as hard as the mineral quartz
Iron is not a mineral used in Moh's hardness scale.
It's called the Ore
Kaolinite is a 2 on the Mohs Hardness Scale.
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
This scale is correctly called the Mohs scale. Scientists use this scale to measure a rock's hardness or softness. They can discover how hard a mineral or rocks is and drill in to it and find out more about it.