A rock's hardness is usually measured in compressive fracture strength rather than a Mohs hardness which measures a mineral's relative hardness in comparison to other minerals. ASTM standard tests have rated gneiss at 50-200 MPa (roughly 350-1400 psi), a range lower than slate, quartzite, or basalt.
The hardness of metagabbro, or schists, depends on their composite minerals.
The hardness of gabbro is 6.
Gabbro is a 6.
4 to 6
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 Mohs scale is used to determine the relative hardness of minerals.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
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.