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Also to know is, what can scratch calcite?
The hardest mineral known, diamond, was assignedthenumber 10. The Mohs Hardness Scale ranks the order of hardnessofminerals and some common objects. For example, yourfingernailcan scratch the minerals talc and gypsum, with ahardness of2 or lower. A copper penny can scratch calcite,gypsum, andtalc.
Regarding this, what will scratch glass?
Hardened steel, such as a file, can scratchglass.Titanium, chromium and even sapphires or rubies canscratchglass, while aluminum or a butter knife blademaynot.
Proceeding with the glass plate, themineralis unable to scratch the glass(hardness = 5.5)at all. This mineral is about 4.0 on theMohs scale. (If amineral indeed scratches glass, youwill beunable to wipe the scratch away.)