Friedrich Mohs

Friedrich Mohs (1773–1839) was a German geologist and mineralogist who devised the Mohs scale, ranking minerals by their resistance to scratching.

Mohs scale: A ten-point ranking of minerals by their resistance to scratching. Mohs devised this scale as a practical tool for distinguishing minerals.
Mohs scale of mineral hardness: A relative scale that ranks ten reference minerals from talc to diamond by scratch resistance. This is the scale Mohs introduced for comparing mineral hardness.
Abraham Gottlob Werner: A German geologist and mineralogist who taught at the Freiberg Mining Academy and developed influential classification systems. Werner taught Mohs and shaped the mineralogical tradition in which he worked.
Frederick Mohs: An alternative English-language spelling of Friedrich Mohs's name. This spelling is common in references to the scale and can obscure the German form.
Mineral: A naturally occurring, usually crystalline solid with a defined chemical composition and structure. Minerals were the objects Mohs classified and compared.
Field geology: The study of geological materials and structures through observations made outdoors. A scratch test lets geologists make quick hardness estimates in the field.
Freiberg Mining Academy: A mining and geology school founded in Freiberg, Saxony, in 1765. Mohs studied and later taught at this institution.
Absolute hardness: A quantitative measure of resistance to indentation or deformation, unlike the ordinal Mohs ranking. It shows why adjacent Mohs numbers do not represent equal differences in hardness.
Mineral identification: The process of determining a mineral's identity from its physical and chemical properties. Mohs developed a systematic way to use hardness in mineral identification.
Gemology: The study of gemstones, including their identification, properties, and treatment. Mohs hardness helps gemologists assess scratch resistance and choose suitable tests.

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