An ancient blue-green stone or mineral mentioned by classical writers, possibly turquoise or a similar semi-precious stone, valued in antiquity.
From Greek 'kallais,' a word for a blue or blue-green stone. The term appears in texts by Pliny and other classical authors who valued these stones highly, suggesting trade routes from distant regions like Central Asia.
The word 'callais' is a linguistic fossil—it tells us exactly what ancient Greeks thought was valuable and worth mentioning by name, and it likely traveled the same Silk Road routes as the actual stones.
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