Definitions for "Mohs scale"
Arbitrary ( quantitative ) units, ranging from 1 to 10, by means of which the scratch hardness of a mineral is determined. Each unit of hardness is represented by a mineral that can scratch any other mineral having a lower-ranking number. The minerals are ranked from talc or 1 ( the softest ), upward through gypsum or 2, calcite or 3, fluorite or 4, apatite or 5, orthoclase or 6, quartz or 7, topaz or 8, corundum or 9, and diamond or 10 (the hardest ).
It is a loose scale of hardness devised by a German mineralogist, Friedrich Mohs in the 19th century. It is used for field collecting, which allows for identification of specimens. The comparative scale of hardness is as follows: 1) talc 2) gypsum 3) calcite 4) fluorite 5) apatite 6) moonstone 7) quartz 8) topaz and beryl 9) corundum 10) diamond
A standard represented by ten mineral of varying hardnesses by which the hardness of other minerals may be rated. From softest to hardest (numbered one to ten), the scale includes: talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond.
Keywords:  pitched, stone, reflection
Reflection Pitched stone