What is Mohs Scale?
Mohs Scale of Mineral Hardness was developed in 1812 by a German geologist and minerologist Friedrich Mohs. He ranked 10 common minerals in terms of their ability to scratch each other. Mohs attributed the lowest value of the scale to the softest mineral talc (which can be scratched by all the minerals listed on the scale above). The highest value was attributed to diamond (which is capable of scratching any of the minerals below). The Mohs scale is not proportional and is only used for rapid mineral evaluation.