There are a number of hardness scales used in modern science. The Moh's hardness scale measures the ability of one sample to scratch another. This is still often used to identify minerals especially by amateurs. Moh's suffers from some some inadequacies, for example one crystal face may be harder than another in a given sample. Metals such as potassium are more often rated on other scales, for example Rockwell or Brinell hardness tests which measure the ability of a diamond point to indent the sample. The Wikipedia page for Potassium gives the moh's hardness as 0.4 however.
It's called the Ore
how hard is diatomite on mohs scale
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
Tourmaline has a hardness of 7-7.5 on the Mohs hardness scale.
It's called the Ore
the mohs hardness scale
how hard is diatomite on mohs scale
The hardness is 3-4 on Mohs scale.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
The Mohs scale is used to determine the relative hardness of minerals.
It is about 2.5 in the Mohs Hardness Scale.
Granite is not assigned a number on the Mohs scale of hardness. The Mohs scale is a measurement of the relative hardness of minerals. Because granite is a rock composed of a variety of minerals, only the individual minerals which compose it have a Mohs hardness.
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
Coal, as an organic sedimentary rock, is not determined to have a hardness on the Mohs scale of mineral hardness.
Tourmaline has a hardness of 7-7.5 on the Mohs hardness scale.