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The scratch test is used to determine a rock's hardness on the Mohs scale, which ranges from 1 (softest) to 10 (hardest). By scratching a rock with a known mineral or material of a specific hardness, you can compare the scratch to known hardness values to classify the rock. This test helps in identifying the rock's mineral composition and potential uses based on its hardness.
This should give you a better understanding of mineral hardness: http://www.answers.com/topic/mohs-scale-of-mineral-hardness
Bauxite, a rock and the main ore of aluminum, does not have a number on the Mohs scale of relative mineral hardness because it is not a mineral, but a combination of minerals.
Hardness in a mineral generally refers to its position on the Mohs scale of mineral hardness, which is a scale of ten index minerals rated from softest (#1) to hardest (#10). Hardness on the Mohs scale is the ability of a given mineral to scratch any mineral below it on the scale, and conversely, the inability of a given mineral to scratch any mineral above it on the scale. Rock hardness is measured differently because a rock is usually composed of two or more minerals, giving it a variable Mohs hardness. Hardness of a rock is most often defined as the ability to resist fracture, and by this standard, it is often the method of the rock's formation and mineral content which determines its hardness. For instance, an igneous rock like granite which cooled from magma has an interlocking crystalline structure of quartz and feldspar minerals is extremely resistant to fracture compared to a sedimentary rock like shale, which is formed from loosely cemented particles of clay minerals.
The hardness of a rock is commonly measured using the Mohs scale of mineral hardness. This scale ranges from 1 to 10, with talc at 1 (the softest) and diamond at 10 (the hardest). Each mineral on the scale can scratch those below it, providing a relative measure of hardness.
Rocks are made up of minerals, which can have varying levels of hardness. The only mineral to have a hardness of 10 is diamond.
== As a rock, bauxite is not listed on the Mohs mineral hardness scale.
The only mineral with a hardness of 10 on Moh's scale is diamond.
The mineral with hardness 3 will get scratched.
Rocks are made up of minerals, which can have varying levels of hardness. The only mineral to have a hardness of 10 is diamond.
It is called "Mohs Hardness Scale" and it measures what the hardness of a rock or mineral. Legardeboy.
Hardness, resistance to weathering, texture, mineral composition, color, and porosity.