sentence: Rocks are made up of one or more minerals.
sentences_before: Mohs scale of mineral hardness' is named after the scientist, Friedrich Mohs, who invented a scale of hardness based on the ability of one mineral to scratch another.
sentences_after: The hardness of a mineral is mainly controlled by the strength of the bonding between the atoms and partly by the size of the atoms. It is a measure of the resistance of the mineral to scratching.
concept_name: rock
headings: Mohs scale of mineral hardness
categories: Friedrich Mohs Minerals