It is about 2.5 in the Mohs Hardness Scale.
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
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
Kaolinite is a 2 on the Mohs Hardness Scale.
The fourth mineral on Mohs' Scale of Hardness is fluorite. It has a hardness of 4 on the scale.
Iodine is not recognized as a mineral, and therefore is not assigned a number on the Mohs Scale of mineral hardness.
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
Talc (1 on the Mohs Hardness Scale) can be scratched by a fingernail.
Quartz has a hardness of 7 on the Mohs scale, making it relatively hard and durable.
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
It's called the Ore
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
Kaolinite is a 2 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
The hardness of uranium is 6 on the Mohs scale; not so hard.
The hardness is 3-4 on Mohs scale.
Nickel has a hardness of 4 on the Mohs scale.