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Hardness of the stones can be tested by _______ in the laboratory.
1. Impact strength
2. Abrasion strength
3. Moh's Scale
4. Crushing strength

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Correct Answer - Option 3 : Moh's Scale

Concept:

Hardness:

  • It is the ability of the material to resist scratch.
  • It is measured by Mohs hardness test in which the mineral substances of known variation in hardness are used to scratch the rock.
  • The following table shows the minerals and their mohs value -
     
Mineral Properties Mohs Value
1. Talc Easily scratched by thumb-nail 1
2. Gypsum Scratched by a thumbnail 2
3. Calcite Not scratched by thumbnail but easily cut by a knife 3
4. Flourite Can be cut by a knife with great difficulty than calcite 4
5. Apatite Can be cut only with difficulty with a knife 5
6.Orthoclase Can be cut with a knife with great difficulty on thin edges 6
7. Quartz Not scratched by steel and can scratch glass. 7
8. Topaz - 8
9. Sapphire - 9
10. Diamond - 10

The following listed test is used for aggregates -

Test Measured quantity
Impact strength test Toughness
Abrasion test Hardness
Crushing strength Compressive strength

  • Abrasion test is used for aggregates while Mohs scale test is used for stones/rocks.

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