Hardness of grits

Relative hardness of the various types of abrasive in comparison with the diamond which is given a MOH value of 10 are as follows:

Commercial name

Formula

Origin

scale

Commercial name

Formula

Origin

scale

Crocus

Fe2O3

Artificial

and natural

5.5-6.5

Quartz

S102

Natural

7.0

(flint, agate)

Garnet

(Almanite)

Al203Fe03Si02

Natural

7.0-8.5

Emery

Si02FeOAl20,

Natural

7.0-9.0

Aluminium oxide

Complex

(corundum)

A1203

Artificial

9.0-9.4

Silicon carbide

(carborundum)

SiC

Artificial

9.5-9.6

Diamond

(carbonado)

c

Natural

10.0

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