The Mohs Scale of Hardness (Testing Properties of Rocks and Minerals)

mineral

This is a solid, non-living material that forms in nature that is chemically the same all over Earth.

hardness

This is the resistance of a rock or mineral of being scratched. Mohs scale measures minerals and ranks them from 1, soft, to 10, hard.

rocks

can't be determined, using Mohs Hardness Scale, because they're hardness and composition are not consistent

Friedrich Mohs

he developed the Mohs Scale of Hardness

to double check

scratch the fingernail, coin, or steel nail with the rock or mineral

diamond

the hardest mineral on the Mohs Scale of Hardness

three or four

the hardness number assigned to a rock or mineral that can be scratched by a coin

seven to ten

the hardness number assigned to a rock or mineral that can be scratched by a diamond

one or two

the hardness number assigned to a rock or mineral that can be scratched by a fingernail

five or six

the hardness number assigned to a rock or mineral that can be scratched by a steel nail

talc

the softest rock on the Mohs Scale of Hardness