Analysis of information sources in references of the Wikipedia article "Gold" in English language version.
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Its scarcity makes it a useful store of value; however, its relative rarity reduced its utility as a currency, especially for transactions in small denominations.
Its scarcity makes it a useful store of value; however, its relative rarity reduced its utility as a currency, especially for transactions in small denominations. ... Rarity is, nevertheless, in itself a source of value, and so is the degree of difficulty which surrounds the winning of the raw material, especially if it is exotic and has to be brought some distance. Gold is, geologically, a relatively rare material on Earth and occurs only in specific places which are remote from most other places.
{{isbn}}: required identifier missing (help) (reprint) Finally, the attribution of the yellow color of gold to relativity rests on the result that the relativistic interband energy between the top of the 5d band and the Fermi level in the half-filled 6s band, 2.4 eV, is close to the experimental value of 2.38 eV, whereas the NR interband energy would be much larger. Comparative R/NR calculations of the reflectivity do not seem to exist. Similarly it would seem that the exact roles of the bulk electronic-band structure and that of surface plasmons have not yet been worked out.
Finally, the attribution of the yellow color of gold to relativity rests on the result that the relativistic interband energy between the top of the 5d band and the Fermi level in the half-filled 6s band, 2.4 eV, is close to the experimental value of 2.38 eV, whereas the NR interband energy would be much larger. Comparative R/NR calculations of the reflectivity do not seem to exist. Similarly it would seem that the exact roles of the bulk electronic-band structure and that of surface plasmons have not yet been worked out.
Finally, the attribution of the yellow color of gold to relativity rests on the result that the relativistic interband energy between the top of the 5d band and the Fermi level in the half-filled 6s band, 2.4 eV, is close to the experimental value of 2.38 eV, whereas the NR interband energy would be much larger. Comparative R/NR calculations of the reflectivity do not seem to exist. Similarly it would seem that the exact roles of the bulk electronic-band structure and that of surface plasmons have not yet been worked out.