The Mohs hardness scale is a relative scale usually used for minerals and does not involve any measurement of deformation, as do other quantitative methods. It simply involves the assignment of a ...

Mineral Monday is a weekly video series exploring the many amazing minerals, fossils, and historic objects on display at the W.M. Keck Earth Science and Mineral Engineering Museum as told by museum ...

According to the available literature, water containing less than 60 mg/L of calcium carbonate is generally considered soft, 60–120 mg/L as moderately hard, 120–180 mg/L as hard, and more than ...