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 — A Poor Man's House • Stephen Sydney Reynolds — Tales of the Jazz Age • F. Scott Fitzgerald — A King's Comrade - A Story of Old Hereford • Charles Whistler — A Budget of Paradoxes, Volume II (of II) • Augustus de Morgan — Jezebel • Wilkie Collins |
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