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Mineralogy:
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gold is sensitive of existing near the geological areas relatively varied (sedimentary rocks, intraplutonic or periplutonic veins), but its weak chemical reactivity makes itself present in the nature under the mineralogical, not very numerous forms well described by F.J. Heinley (3); take a look at the following information:
Mineral: Natural Gold Composition: Au
Content in Gold: 75
Density: 16 – 19
Durability: 2, 5 – 3
Mineral: Electrum Composition: (Au, Ag)
Content in Gold: 45 – 75
Density: 13 – 16
Durability: 2 – 2, 5
Mineral: Calaverite Composition: Au Te2
Content in Gold: 40
Density: 9, 2 Durability: 2,5 – 3
Mineral: Krenerite Composition: Au4 Au Te10
Content in Gold: 31 – 44
Density: 8,6
Durability: 2,5
Mineral: Silvanite Composition: Au Ag Te4
Content in Gold: 24 – 30
Density: 8,2
Durability: 1,5 – 2
Mineral: Petzite Composition: Ag3 Au Te2
Content in Gold: 19 – 25
Density: 9,1
Durability: 2,5
Mineral: Hesyte Composition: Ag2 Te
Content in Gold: -5
Density: 8,4
Durability: 2,5 – 3
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