Mohs hardness scale

   a 1-10 scale for estimating the hardness of a mineral, introduced by the German geologist Friedrich Mohs (1773-1839) in 1812. To apply the scale, one attempts to scratch the mineral with standard minerals assigned hardness numbers as follows: diamond 10, corundum 9, topaz 8, quartz 7, orthoclase 6, apatite 5, fluorite 4, calcite 3, gypsum 2, and talc 1. If, for example, the mineral is scratched by quartz but not by orthoclase, then its hardness is between 6 and 7.

Dictionary of units of measurement. 2015.

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  • Mohs hardness scale — Moso skalė statusas T sritis Standartizacija ir metrologija apibrėžtis Mineralų kietumo skalė, kurią sudaro 10 kietumo etalonų, pvz., talko kietumas – 1, deimanto – 10. atitikmenys: angl. Mohs hardness scale; Mohs scale vok. Härteskala nach Mohs …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Mohs hardness scale and observations on hardness of some additional materials — ▪ Table Mohs hardness scale and observations on hardness of some additional materials mineral Mohs hardness other materials observations on the minerals talc   1 very easily scratched by the fingernail; has a greasy feel gypsum   2 Mohs hardness… …   Universalium

  • Mohs hardness — Rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised by German mineralogist Friedrich Mohs in 1812. Minerals are ranked in comparison with the Mohs scale, which is made up of 10… …   Universalium

  • hardness — /hahrd nis/, n. 1. the state or quality of being hard: the hardness of ice. 2. a relative degree or extent of this quality: wood of a desirable hardness. 3. that quality in water that is imparted by the presence of dissolved salts, esp. calcium… …   Universalium

  • Mohs scale — Moso skalė statusas T sritis Standartizacija ir metrologija apibrėžtis Mineralų kietumo skalė, kurią sudaro 10 kietumo etalonų, pvz., talko kietumas – 1, deimanto – 10. atitikmenys: angl. Mohs hardness scale; Mohs scale vok. Härteskala nach Mohs …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Mohs-Härtskala — Moso skalė statusas T sritis Standartizacija ir metrologija apibrėžtis Mineralų kietumo skalė, kurią sudaro 10 kietumo etalonų, pvz., talko kietumas – 1, deimanto – 10. atitikmenys: angl. Mohs hardness scale; Mohs scale vok. Härteskala nach Mohs …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • hardness —    a measure of the hardness of a metal or mineral. Hardness is a property easy to appreciate but difficult to quantify and measure.    The Mohs hardness scale is used in geology to give a rough estimate of hardness by testing which minerals are… …   Dictionary of units of measurement

  • Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …   Wikipedia

  • Hardness — This article is about mechanical properties of materials. For other uses, see Hard. Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Macroscopic hardness is generally… …   Wikipedia

  • Hardness of prominent abrasive materials — ▪ Table Hardness of prominent abrasive materials abrasive materials hardness Mohs scale (Mohs hardness) Vickers scale (Vickers hardness) Knoop scale (Knoop hardness) Natural abrasives industrial diamond 10 10,000 8,000 corundum 9 2,200 1,600… …   Universalium

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