Geologists do it according to the Mohs Scale of Hardness ... are four times harder than Corundum and six times harder than Topaz, but no one's adjusting. Instead, people roughly place things ...

Topaz Topaz is a similar-looking, but much cheaper version of yellow sapphire, this gemstone is easily available and doesn't cost much. On the Mohs scale, the hardness of topaz is 8.0 which is ...

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 ...

Those girls can flirt and other queer things can do. It's not, these days, a very acceptable mnemonic for remembering Friedrich Mohs' ordering of minerals according to hardness (talc, gypsum ...