mohs’ scale hardness

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 mohs’ scale  hardness 

http://advices-and-information-engineering.blogspot.com/

 mohs’ scale  hardness 

Geologists use mohs’ scale hardness using minerals  ( 1-10)in the scale to work out the hardness of other  minerals  .

   hardness :-is an important characteristic of minerals mohs selected on 10 minerals hr arranged them of order of  hardness

                                mohs’ scale  

              1                             Talk

               2                        Gypsum                      

              3                             Calcite

              4                             Fluorite

              5                            Apatite

              6                            Orthoclase

              7                            Quartz

              8                            Topaz

              9                            Corundum

              10                           Dimond 

Mohs Scale of Mineral Hardness In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals because they were common or readily available. The scale is not a linear scale, but somewhat arbitrary. Hardness

Mineral

Associations and Uses

1

Talc
Talcum powder.

2

Gypsum
Plaster of paris. Gypsum is formed when seawater evaporates from the Earth’s surface.

3

Calcite
Limestone and most shells contain calcite.

4

Fluorite
Fluorine in fluorite prevents tooth decay.

5

Apatite
When you are hungry you have a big "appetite".

6

Orthoclase
Orthoclase is a feldspar, and in German, "feld" means "field".

7

Quartz

8

Topaz
The November birthstone. Emerald and aquamarine are varieties of beryl with a hardness of 8.

9

Corundum
Sapphire and ruby are varieties of corundum. Twice as hard as topaz.

10

Diamond
Used in jewelry and cutting tools. Four times as hard as corundum.
Hardness of some other items:

2.5

Fingernail

2.5–3

Gold, Silver

3

Copper penny

4-4.5

Platinum
4-5
Iron
5.5
Knife blade
6-7
Glass
6.5
Iron pyrite
7+
Hardened steel file
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