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  2. File:Platinum-nugget.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Platinum-nugget.jpg

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  3. Native metal - Wikipedia

    en.wikipedia.org/wiki/Native_metal

    Most gold is mined as native metal and can be found as nuggets, veins or wires of gold in a rock matrix, or fine grains of gold, mixed in with sediments or bound within rock. The iconic image of gold mining for many is gold panning, which is a method of separating flakes and nuggets of pure gold from river sediments due to their great density ...

  4. Bowieite - Wikipedia

    en.wikipedia.org/wiki/Bowieite

    Bowieite is a rhodium-iridium-platinum sulfide mineral (Rh,Ir,Pt) 2 S 3, found in platinum-alloy nuggets from Goodnews Bay, Alaska. [2] [3] [1] It was named (by the IMA in 1984) after the British scientist Stanley Bowie (1917–2008), in recognition of his work on identification of opaque minerals.

  5. Precious metal - Wikipedia

    en.wikipedia.org/wiki/Precious_metal

    Gold nugget A selection of precious metal elements; gold, silver, platinum, palladium, copper, ruthenium, rhodium, rhenium, osmium, iridium and mercury. They are labeled and arranged by their location on the periodic table. Precious metals are rare, naturally occurring metallic chemical elements of high economic value.

  6. Platinum group - Wikipedia

    en.wikipedia.org/wiki/Platinum_group

    Naturally occurring platinum and platinum-rich alloys were known by pre-Columbian Americans for many years. [5] However, even though the metal was used by pre-Columbian peoples, the first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger (1484–1558) as a description of a mysterious metal found in Central American mines between ...

  7. A few other images are of low quality but it might be hard to find versions of higher quality: Ba (oxidises too easily), Pm, Ra, Pa (radioactives). A few images are only available as fair-use: Po, Np, Cm. It may be possible to find a free alternative (although it would be quite difficult).

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  9. Placer deposit - Wikipedia

    en.wikipedia.org/wiki/Placer_deposit

    Placer minerals are defined as having a specific gravity above 2.58. [1] The separation of the valuable minerals from the most common non-economic mineral, quartz, depends on the difference in specific gravity / density.The weathering process allows for the accumulation of placer minerals, while less dense material such as quartz are swept away.