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wikipedia) Che cos'è la scala di Mohs | News Today
La scala di Mohs è un criterio empirico per la valutazione della durezza dei materiali. Prende il nome dal mineralogista tedesco Friedrich Mohs, che la ideò nel 1812. Essa assume come riferimento la durezza di dieci minerali numerati progressivamente da 1 a 10, tali che ciascuno è in grado di scalfire quello che lo precede ed è scalfito da quello che lo segue.
Il primo minerale della serie è il talco, l'ultimo il diamante. La scala di Mohs fornisce un valore puramente indicativo della durezza, in quanto la differenza reale di durezza tra due minerali successivi varia anche notevolmente. Per esempio il corindone (n. 9 di questa scala) è circa sei volte più duro del topazio (n. 8), mentre il diamante (n. 10) risulta essere circa 140 volte più duro del corindone, come è stato messo in evidenza dalle prove sperimentali del mineralogista August Rosiwal.
Per determinare la durezza di un minerale non si fa altro che provare quale minerale della scala esso scalfisce e da quale è scalfito.
Esiste anche una scala assoluta di durezza, la scala di Rosiwal, che fornisce il valore reale della durezza, ottenuto con prove di laboratorio usando uno sclerometro. In tale scala viene attribuita al corindone (minerale che comprende molte pietre preziose, tra cui il rubino e lo zaffiro) una durezza di riferimento pari a 1.000.
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Che cos'è la scala di Mohs | News Today
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Che cos'è la scala di Mohs | News Today
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