The property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale.
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"Hardness" Quotes from Famous Books ![]() ![]() — The Strange Adventures of Mr. Middleton • Wardon Allan Curtis ![]() ![]() — How To Behave: A Pocket Manual Of Republican Etiquette, And Guide To Correct Personal Habits • Samuel R Wells ![]() ![]() — Greek Studies: A Series of Essays • Walter Horatio Pater ![]() ![]() — Barometer and Weather Guide • Robert Fitzroy ![]() ![]() — Pepita Ximenez • Juan Valera |
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