It's pretty freakin hard!
the mineral that has a hardness of 7 is "Quarts
Mineral hardness is measured by how resistant one mineral is to being rubbed against another. If the mineral displays clear abrasion then it has low hardness whereas if it displays little abrasion it is a hard mineral.
Orthoclase Feldspar.
Galena
Minerologists identify mineral harness with a variety of tools. In order of hardness, they gnerally use their fingernails, nails, copper pennies, knife blades, glass, porcelain and other minerals such as quartz, topaz, corundum and diamond. The Moh's Hardness Scale gives a list of minerals in order of hardness with talc being the softest with a rating of "1" and diamond the hardest at a "10".
It's pretty freakin hard!
The mineral with hardness 3 will get scratched.
Bloodstone is not a rock, but a gemstone variety of the mineral quartz, in cryptocrystalline form.
the mineral that has a hardness of 7 is "Quarts
The mineral with the greatest hardness is the diamond.
the mineral that has a hardness of 7 is "Quarts
Ruby, a variety of the mineral corundum, has a hardness of 9 on the Mohs scale of mineral hardness.
Hardness is the measure of how easily a mineral is scratched.
Hardness is better.
The Mohs scale of mineral hardness is generally used to determine the hardness of a mineral. The Mohs scale rates the ability of mineral to scratch or be scratched by another mineral.
Gypsum is the mineral listed at 2 on the Mohs hardness scale.
Hardness measures a mineral's resistance to being scratched.