Orichalcum
Orichalcum or aurichalcum is a metal mentioned in several ancient writings, including the story of Atlantis in the "Critias" of Plato. Within the dialogue, Critias (460–403 BC) claims that orichalcum had been considered second only to gold in value and had been found and mined in many parts of Atlantis in ancient times, but that by Critias's own time orichalcum was known only by name.

Orichalcum may have been a noble metal such as platinum, as it was supposed to be mined, or one type of bronze or brass or possibly some other metal alloy.

In numismatics, orichalcum is the golden-colored bronze alloy used by the Roman Empire for their sestertius and dupondius coins.
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metal
Concept
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Atlantis
Concept
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Critias
ORG
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Plato
PER
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Critias
PER
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gold
Concept
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platinum
Concept
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bronze
Concept
Q39782
brass
Concept
Q37756
alloy
Concept
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numismatics
Concept
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Roman Empire
LOC
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sestertius
MISC
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dupondius
Concept
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Orichalcum
Concept
Q731033
Orichalcum
Concept
+460^^http://www.w3.org/2001/XMLSchema#decimal
460
NUMBER
+403^^http://www.w3.org/2001/XMLSchema#decimal
403
NUMBER
instance of
described by source
author
notable work
currency