Gold

Bacteria Gold https://www.sciencedaily.com/releases/2017/04/170428093915.htm

24 karat gold - 99.9% Density 19.32 g/cm^3 18 karat gold - 75% Density 15.44 g/cm^3 ( 75% gold, 12.5% silver and 12.5% copper (by mass)) 14 karat gold - 58% Density between 12.9 and 14.6 gm/cm^3 Silver 10.49 Lead 11.34 Mercury Uranium 18.9 Gold 19.32 Tungsten 19.6 Rhenium 21.02 Platinum 21.4 Iridium 22.56 Osmium 22.6

How does gold form? https://www.youtube.com/watch?v=sp4ATJfBZ6s http://www.nature.com/news/earthquakes-make-gold-veins-in-an-instant-1.12615 http://www.goldrushnuggets.com/howdogofo.html http://www.bbc.com/news/magazine-22904141 http://www.sciencedaily.com/releases/2011/09/110907132044.htm http://www.abc.net.au/science/articles/2013/12/03/3903924.htm http://www.abc.net.au/science/articles/2013/12/10/3908102.htm http://www.sciencedirect.com/science/article/pii/S0305440314001484 https://www.scientificamerican.com/article/fact-or-fiction-lead-can-be-turned-into-gold/

Why is Gold so rare. https://www.youtube.com/watch?v=jB0MZAzNPPc