mohs

Unfortunately, they're so soft that a fingernail (a 2.5 on the Mohs scale) will leave huge gouges quickly.

Not a geologist but Mohs hardness is an ordinal scale so the distance between 10 and 9 isn't well-defined.

Normal window glass is Mohs hardness 5.5 or so, as is unhardened steel (your fork and pocketknife); hardened steel (e.g.

Yes, moissanite is a 9.25-9.5 on the Mohs scale, whereas Sapphire is only a 9.

There are lots of things with Mohs hardness above 5.5, including most common metals (except brass, aluminum, copper) and most rocks.

Just like diamonds are no longer at the top of the mohs scale.

Gorilla Glass has Mohs hardness of about 9, so quartz won't scratch it.

At a 10 on the mohs scale diamond is still best for hardness.

It’s definitely price performant at 6.5 on the mohs scale, sapphire panels are 2-4x more expensive to produce but 9 on the mohs scales so they’re typically only found in watches I bet.

It's all about hardness [1], ordinary iron / metal is quite soft (4 - 5) scale on mohs scale, while gorilla glass is at least a 7.

That mohs 10 hardness pick finally came in use.

There's no Mohs scale of hardness of SF.

Hell, Wikipedia even says in the first paragraph "the Mohs scale is not suitable for accurately gauging the hardness of industrial materials." This argument doesn't even reflect a first-paragraph-Wikipedia-level understanding of the topic.

It's often made up of crystalline quartz (Mohs hardness 7) which can scratch regular glass easily.

Almost as hard as diamond (Mohs 9), but much less prone to cracking than diamond.

Notable, then, is the fact that Apple felt the need to make their lens covers out of sapphire (Mohs hardness of 9).