The Spetisbury ring, 14 mm across, was made from a round gold bar, with stripes of electrum inlaid in a continuous spiral. |
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Gold most commonly occurs as a pure metal called native gold or as a natural alloy with silver called electrum. |
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Normally, in mineralogy, argentiferous gold containing 20-25 per cent of silver is referred to as electrum. |
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The major mineral species of silver are native silver and acanthite, but kuestellite and electrum are present. |
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Ore mineralization consists of free gold, electrum, and pyrargyrite. |
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Although silver was sometimes alloyed with gold to form electrum, it was hardly ever used alone in the production of amulets. |
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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. |
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They are made out of electrum, a mix of gold and silver. |
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He has named the new pygmy locust Electrotettix attenboroughi, the genus name a combination of electrum and tettix. |
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The principal metals of which ancient coins were made were electrum, gold, silver, copper, brass, and bronze all of them more or less resistant to decay. |
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The earliest coins were made of electrum, a natural mixture of gold and silver, and were crude, bean-shaped ingots bearing a primitive punch mark certifying to either weight or fineness or both. |
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The electrum details are attached with rivets. |
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A natural alloy containing more than 20 per cent silver is called electrum, and was regarded by the ancients as a different metal from gold. |
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The coins of Lydia were made of electrum, which is a naturally occurring alloy of gold and silver, that was available within the territory of Lydia. |
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Her robes shimmered with wards of unsight stitched in electrum thread. |
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