What is the hardest mineral?

Talc is a mineral composed of hydrated magnesium silicate. On the scale of 10 hardest minerals, talc is listed as 1 on the Mohs hardness scale. Only caesium,rubidium with 0.2-0.3 hardness and lithium, sodium and potassium with 0.5-0.6 hardness are softer than Talc. read more

Diamond is always at the top of the scale, being the hardest mineral. There are ten minerals in Mohs scale, talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and for last and hardest, diamond. read more

Minerals. The Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to scratch another mineral visibly. The samples of matter used by Mohs are all different minerals. Minerals are chemically pure solids found in nature. Rocks are made up of one or more minerals. read more