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Gold Gold is used as a standard against which wealth is measured. Pure gold is a dense (SG=19.3) but soft (H=2.5-3) metal. Before it can be used, it has to be refined and for most uses it is alloyed with other metals to make it harder. Purity of gold for jewellery is measured in carats, pure gold being 24 carats. |
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Platinum Platinum plays a key role in modern technology. It is used as a standard weight, for surgical instruments and of course in jewellery. The name is derived from platina meaning little silver. |
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Silver Crystals of silver are rare, but cubic crystals are occasionally found. In medieval times, silver was more valuable than gold. It was the main metal used for money and was also used for fine metal-work. |
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