Final answer:
The Mohs' scale of mineral hardness was created by Frederich Mohs in 1822 to classify rocks and minerals based on their hardness. It is a qualitative scale with no quantitative relationship between hardness values.
Step-by-step explanation:
The hardness scale used to classify rocks and minerals is called the Mohs' scale of mineral hardness. It was created by Frederich Mohs in 1822.
The scale is qualitative, meaning that there is no quantitative relationship between hardness values. It is based on the relative relationship between 10 different minerals, with lower numbers indicating softer minerals and higher numbers indicating harder minerals.