mineral

Gold and Silver (Metal Components of an Antique Pocket Watch)

Native Gold (Au) and Native Silver (Ag)

Gold: Hardness 2.5-3, yellow metallic luster, isometric system, SG 19.3. Silver: Hardness 2.5-3, white metallic luster, isometric system, SG 10.5. These metals are highly malleable and ductile.

Identified March 15, 2026More mineral →

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Physical properties

Gold: Hardness 2.5-3, yellow metallic luster, isometric system, SG 19.3. Silver: Hardness 2.5-3, white metallic luster, isometric system, SG 10.5. These metals are highly malleable and ductile.

Formation & geological history

Formed in hydrothermal veins, volcanic deposits, and through the cooling of magma. Often associated with quartz veins or found in alluvial placer deposits. These specific metals were refined from ore deposits usually millions of years old.

Uses & applications

Used in high-value jewelry, horology (watchmaking), electronics, and as a store of monetary value. The specimen shown is a 1920s-era Hamilton pocket watch case and chain.

Geological facts

Hamilton was known as the 'Watch of Railroad Accuracy.' The gold used in such watches was often 'gold-filled' or 14k gold, which is an alloy mixed with copper or silver to increase durability for daily use.

Field identification & locations

Identify by weight (density), metallic luster, and hallmark stamps (e.g., '14K', 'Gold Filled'). In a geological field setting, look for heavy mineral concentrations in stream beds or metallic veins in quartz. For collectors, check for maker marks and case material stamps.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral