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One of two scales measuring the hardness of materials. The original Mohs scale listed 10 sustances of increasing hardness: talc (1), gypsum (2), calcite (3), fluorite (4), apatite (5), orthoclase (6), quartz (7), topaz (8), corundum (9), and diamond (10); the modified Mohs scale lists 15 minerals and is known more commonly as the hardness scale. See: hardness scale.
Mohs scaleA system that qualifies minerals according to hardness, ranging from talc (1) to diamond (15).
Mohs,Friedrich, German mineralogist, 1773-1839.
Mohs hardness number - a number on a mineralogic scale.
Mohs scale - a qualitative scale in which minerals are classified in order of their increasing hardness. Synonym(s): hardness scale