Copper

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Cu

HARDNESS 2.5-3

SG 8.6-8.9

Silver

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Ag

HARDNESS 10.1
SG 10.1-10.5

GOLD

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Au

HARDNESS 2.5

SG 19.1 -19.3

Graphite*

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C

HARDNESS 1.5

SG 2.0-2.2

Diamond*

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C

HARDNESS 10

SG 3.2-3.5

Sulphur

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S

HARDNESS 1.5-2.5

SG 2.0-2.1

Chalcocite

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Cu₂S

HARDNESS 2.5-3

SG 5.1-5.8

Bornite

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Cu₅FeS₄

HARDNESS 3

SG 4.5-5.4

Argentite

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Ag₂S

HARDNESS 2-2.5

SG 6.8-7.3

Pentlandite

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(Fe, Ni)₉S₈

HARDNESS 3-4

SG 4.6-5.2

Sphalerite

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ZnS

HARDNESS 3.5-4

SG 3.8-4.2

Pyrrhotite

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Fe_(1-x)S

HARDNESS 4

SG 4.1-4.6

Chalcopyrtie

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CuFeS₂

HARDNESS 4

SG 3.8-4.2

NiAs

HARDNESS 5-5.5

SG 7.3-7.9

Millerite

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NiS

HARDNESS 3-4

SG 5.2-5.6