Hardness

Moh's Hardness
Minerals
Absolute
Hardness

Simple
Equivalents

1
talc

0.03

2
gypsum

1.25

fingernail easy
3
calcite

4.50

copper coin
4
flourie

5.00

knife blade easy
5
apatite

6.50

knife blade tough
6
orthoclase

37.00

steel file
7
quartz

120.00

will scratch window glass
8
topaz

175.00

9
corundum

1,000.00

10
diamond

140,000.00