Mohs scale


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Mohs scale

(mōz),
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 scale

A 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
References in periodicals archive ?
Dispute: The Mohs scale ranks the hardness of minerals--from 1 for softest to 10 for hardest The diamond rates a 10 because it is the hardest mineral on Earth.
And because of the remarkable hardness of sapphires—9 on the Mohs scale and of aluminium oxide in general, sapphires are used in some non-ornamental applications, including infrared optical components, such as in scientific instruments; high-durability windows; wristwatch crystals and movement bearings; and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs).
The hardness of a kyanite crystal face in the long direction is 4-5 on the Mohs scale, and in the perpendicular direction it is 6-7.
Due to its hardness (diamond is 10 on the Mohs scale, moissanite 9.