| Ore mineralization consists of free gold, electrum, and pyrargyrite. |
| The major mineral species of silver are native silver and acanthite, but kuestellite and electrum are present. |
| Gold most commonly occurs as a pure metal called native gold or as a natural alloy with silver called electrum. |
| Numismatists firmly believe that the first coins were made of electrum, a naturally-occurring alloy mostly of gold and silver, with traces of other metals. |
| Normally, in mineralogy, argentiferous gold containing 20-25 per cent of silver is referred to as electrum. |
| The Spetisbury ring, 14 mm across, was made from a round gold bar, with stripes of electrum inlaid in a continuous spiral. |
