Mohs Scale
3
Li
Lithium
0.6
4
Be
Beryllium
5.5
5
B
Boron
9.3
6
C
Carbon
0.5
11
Na
Sodium
0.5
12
Mg
Magnesium
2.5
13
Al
Aluminium
2.75
14
Si
Silicon
6.5
16
S
Sulphur
2
19
K
Potassium
0.4
20
Ca
Calcium
1.75
22
Ti
Titanium
6
23
V
Vanadium
7
24
Cr
Chromium
8.5
25
Mn
Manganese
6
26
Fe
Iron
4
27
Co
Cobalt
5
28
Ni
Nickel
4
29
Cu
Copper
3
30
Zn
Zinc
2.5
31
Ga
Galium
1.5
32
Ge
Germanium
6
33
As
Arsenic
3.5
34
Se
Selenium
2
37
Rb
Rubidium
0.3
38
Sr
Strontium
1.5
40
Zr
Zirconium
5
41
Nb
Niobium
6
42
Mo
Molybdenum
5.5
44
Ru
Ruthenium
6.5
45
Rh
Rhodium
6
46
Pd
Palladium
4.75
47
Ag
Silver
2.5
48
Cd
Cadmium
2
49
In
Indium
1.2
50
Sn
Tin
1.5
51
Sb
Antimony
3
52
Te
Tellurium
2.25
55
Cs
Caesium
0.2
56
Ba
Barium
1.25
57
La
Lanthanum
2.5
58
Ce
Cerium
2.5
59
Pr
Praseodymium
1.4
60
Nd
Neodymium
1.2
62
Sm
Samarium
1.4
63
Eu
Europium
3.1
64
Gd
Gadolinium
5.1
65
Tb
Terbium
2.3
66
Dy
Dysprosium
1.8
67
Ho
Holmium
1.6
68
Er
Erbium
2
69
Tm
Thulium
1.8
71
Lu
Lutetium
2.6
72
Hf
Hafnium
5.5
73
Ta
Tantalum
6.5
74
W
Tungsten
7.5
75
Re
Rhenium
7
76
Os
Osmium
7
77
Ir
Iridium
6.5
78
Pt
Platinum
3.5
79
Au
Gold
2.5
81
Tl
Thallium
1.2
82
Pb
Lead
1.5
83
Bi
Bismuth
2.25
90
Th
Thorium
3
92
U
Uranium
6