Gold has been one of the most sought after elements and precious metals since man has walked the planet. Gold is an element, that is, it is pure and not a compound of different chemicals (such as water which is hydrogen and oxygen, or silica (sand) which is a mixture of silicon and oxygen). The chemical symbol for gold is Au which is derived from the Latin word for gold, Aurum - this is the same base root for words such as "aura" and it means bright and shining.
Gold is bright and shiny when it is polished up and it does not rust, that is oxidize - react with oxygen. The reason for this is because pure gold is highly stable as a chemical element and not prone to reacting with other elements and compounds. This property combined with the fact that the metal is relatively soft has meant it is easy to work into decorative items and particularly jewelry. It is not simply jewelry which gold has been used for but also sculpture and building decoration - just look at the gold leaf covering of the majestic domes of the Islamic mosques such as Al-Aqsa in Jerusalem.
Gold is found as nuggets in the earth or in veins within rock formations though the early Gold Rushes in California were actually primarily found in the river beds and alluvial deposits of flood plains as grains and dust. One tale has been handed down from those early gold rush times of how a gold miner walked into a bar and when asked how he was going to pay, he shook his beard and $20 of gold dust was shaken out of his face fuzz! True or not, but this tale simply reinforces the folklore which has built up around this attractive metal.
Pure gold is bright yellow and it does not react with air or water (as we said earlier it does not "rust") and the sheen or luster is universally considered highly attractive. Early coins were constructed of gold to set weight and purity - the value of the coin was in the gold that made the coinage up and not in the "promise" the coin represented as is the case with our modern currency. That said, currency today must still be backed by something of value and until 1971, gold was the standard by which a currency was valued (known as the Bretton Woods system).
Gold is obviously used in making jewelry but it also has many other uses; modern uses include dentistry and electronics. Gold is also an excellent conductor of electricity and because it is highly stable and un-reactive, this makes it ideal for use in sensitive electronics particularly for those going into space.
The test for gold is to drop it into nitric acid - nitric acid will dissolve silver and base metals but not gold. If the metal is not attacked by the nitric acid then it is gold and this test became the basis for the phrase, "acid test".
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