Which Mineral Has The Same Hardness As A Fingernail?

What Mineral Has the Same Hardness As a Fingernail? The hardness of minerals is measured using the Mohs scale. The range is from one (softest) to ten (hardest), and the hardest material on the scale is diamond. A fingernail is about 2.5 times harder than a steel nail, and the harder the nail is, the … Read more

How Strong Are Sapphires?
How Strong Are Sapphires?

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