Silver, gold, platinum are found native in the ground as elements instead of compounds How?
Also I was just wondering why is there lots of aluminium in the ground, way more than iron, but it is more expensive to buy. It probably has to do with reactivity and extracting from ore costs.
Ag, Au, an Pt are found native in the earth, and not as compounds, because they are stable metals, and not easily oxidized, as are other metals. There are plenty of examples of other elements that ore found in nature as elements (O2, N2, He, Ne, Ar, C, H2, Rn, Xe, S).
Al is so expensive due to the fact that is need to be obtained from the refining of alumina (Al2O3) – the Deville process
ref: http://en.wikipedia.org/wiki/Deville_process
or the Oersted process (from AlCl3)
ref: http://en.wikipedia.org/wiki/W%C3%B6hler_process
Streams of Silver and Gold – Native American Flute and Guitar – Scenic Nature
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new oval sterling silver plated native woman water girl bolo tie mop ? abalone $22.00 |
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Native Vintage Blue Turquoise Crystal inlay Bead Tibet silver link Bracelet HOT $7.91 |
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SILVER FEATHER TIGER’S EYE TURQUOISE NAVAJO BEAD NATIVE HEARTS CHROME NECKLACE $99.99 |
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STERLING SILVER FEATHER ONYX TURQUOISE NATIVE NAVAJO BEAD HEARTS CHROME NECKLACE $99.99 |
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R Sterling Silver Screwback Turquoise Native Earrings $59.10 |
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Vintage Native Turquoise & Sterling SIlver Ring size 6 1/2 $89.00 |
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