It depends how thick, but usually steel. steel because it does not shadder into pices and is harder to break and also usually come in thicker sizes.
The mineral that is softer than a steel file but harder than glass is typically quartz. Quartz has a hardness of about 7 on the Mohs scale, while glass usually ranges around 5.5, and steel files can be harder, often rated around 6.5 to 7.5 depending on the specific type of steel. Therefore, quartz fits the criteria of being softer than a steel file but harder than glass.
On the Mohs hardness scale glass is harder than steel. Mohs hardness tests the ability of one material to scratch another. Steel is rated 4 to 4.5 and glass is rated at 6 to 7. http://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness Glass is harder than steel, but it is more fragile and will break much easier. There are many different ways to measure strength. Here is a wikipedia article about the strength of materials: http://en.wikipedia.org/wiki/Strength_of_materials
Why is quartz harder steel
Diamond is harder than steel: you can scratch steel with a diamond, but steel will not scratch a diamond.
Tungsten is a metal that is harder than steel.
After cleaning the steel and glass, use JB weld to bond glass to Steel.
Glass is easy to break and steel is hard
steel
Yes, most steel is harder than pure platinum. Steel is an alloy of several different elements. If you were to add alloying elements to Platinum, it would become harder as well.
What is 5 times stronger than metal? Steel - Because steel is a compound which steel is like a hard rock! Unbreakable! Steel can be even harder then ever which means it can be stronger then 5 more like 100 but that is only SOME types! Steel is way harder, yes 5 times harder!
glass can be organic. brick is manmade steel can be organic
Many things are harder than stainless steel. Stainless steel can vary in hardness depending on the alloy and any treatment(s), but lots of carbon steels can be harder. Certainly diamond is harder as it is the hardest substance known to man.