Hardnesses of the elements (data page)

[edit] Mohs hardness

number	symbol	name	Mohs hardness
3	Li	lithium	0.6
4	Be	beryllium	5.5
5	B	boron	9.3
6	C	carbon	(graphite) 0.5
6	C	carbon	(diamond) 10.0
11	Na	sodium	0.5
12	Mg	magnesium	2.5
13	Al	aluminium	2.75
14	Si	silicon	6.5
16	S	sulfur	2.0
19	K	potassium	0.4
20	Ca	calcium	1.75
22	Ti	titanium	6.0
23	V	vanadium	7.0
24	Cr	chromium	8.5
25	Mn	manganese	6.0
26	Fe	iron	4.0
27	Co	cobalt	5.0
28	Ni	nickel	4.0
29	Cu	copper	3.0
30	Zn	zinc	2.5
31	Ga	gallium	1.5
32	Ge	germanium	6.0
33	As	arsenic	3.5
34	Se	selenium	2.0
37	Rb	rubidium	0.3
38	Sr	strontium	1.5
40	Zr	zirconium	5.0
41	Nb	niobium	6.0
42	Mo	molybdenum	5.5
44	Ru	ruthenium	6.5
45	Rh	rhodium	6.0
46	Pd	palladium	4.75
47	Ag	silver	2.5
48	Cd	cadmium	2.0
49	In	indium	1.2
50	Sn	tin	1.5
51	Sb	antimony	3.0
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
72	Hf	hafnium	5.5
73	Ta	tantalum	6.5
74	W	tungsten	7.5
75	Re	rhenium	7.0
76	Os	osmium	7.0
77	Ir	iridium	6.5
78	Pt	platinum	3.5
79	Au	gold	2.5
80	Hg	mercury	1.5
81	Tl	thallium	1.2
82	Pb	lead	1.5
83	Bi	bismuth	2.25
90	Th	thorium	3.0
92	U	uranium	6.0

number	symbol	name	Vickers hardness/(MN/m²)
4	Be	beryllium	1670
5	B	boron	49000
13	Al	aluminium	167
22	Ti	titanium	970
23	V	vanadium	628
24	Cr	chromium	1060
26	Fe	iron	608
27	Co	cobalt	1043
28	Ni	nickel	638
29	Cu	copper	369
40	Zr	zirconium	903
41	Nb	niobium	1320
42	Mo	molybdenum	1530
45	Rh	rhodium	1246
46	Pd	palladium	461
47	Ag	silver	251
57	La	lanthanum	491
58	Ce	cerium	270
59	Pr	praseodymium	400
60	Nd	neodymium	343
62	Sm	samarium	412
63	Eu	europium	167
64	Gd	gadolinium	570
65	Tb	terbium	863
66	Dy	dysprosium	540
67	Ho	holmium	481
68	Er	erbium	589
69	Tm	thulium	520
70	Yb	ytterbium	206
71	Lu	lutetium	1160
72	Hf	hafnium	1760
73	Ta	tantalum	873
74	W	tungsten	3430
75	Re	rhenium	2450
77	Ir	iridium	1760
78	Pt	platinum	549
79	Au	gold	216
90	Th	thorium	350
92	U	uranium	1960

number	symbol	name	Brinell hardness/(MN/m²)
4	Be	beryllium	600
11	Na	sodium	0.69
12	Mg	magnesium	260
13	Al	aluminium	245
19	K	potassium	0.363
20	Ca	calcium	167
21	Sc	scandium	750
22	Ti	titanium	716
23	V	vanadium	628
24	Cr	chromium	1120
25	Mn	manganese	196
26	Fe	iron	490
27	Co	cobalt	700
28	Ni	nickel	700
29	Cu	copper	874
30	Zn	zinc	412
31	Ga	gallium	60
33	As	arsenic	1440
34	Se	selenium	736
37	Rb	rubidium	0.216
39	Y	yttrium	589
40	Zr	zirconium	650
41	Nb	niobium	736
42	Mo	molybdenum	1500
44	Ru	ruthenium	2160
45	Rh	rhodium	1100
46	Pd	palladium	37.3
47	Ag	silver	24.5
48	Cd	cadmium	203
49	In	indium	8.83
50	Sn	tin	51
51	Sb	antimony	294
52	Te	tellurium	180
55	Cs	caesium	0.14
57	La	lanthanum	363
58	Ce	cerium	412
59	Pr	praseodymium	481
60	Nd	neodymium	265
62	Sm	samarium	441
65	Tb	terbium	677
66	Dy	dysprosium	500
67	Ho	holmium	746
68	Er	erbium	814
69	Tm	thulium	471
70	Yb	ytterbium	343
71	Lu	lutetium	893
72	Hf	hafnium	1700
73	Ta	tantalum	800
74	W	tungsten	2570
75	Re	rhenium	1320
76	Os	osmium	3920
77	Ir	iridium	1670
78	Pt	platinum	392
79	Au	gold	2450
81	Tl	thallium	26.4
82	Pb	lead	38.3
83	Bi	bismuth	94.2
90	Th	thorium	400
92	U	uranium	2400

As quoted at http://www.webelements.com/ from this source:

G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968.