A type of mineral or gemstone that was historically believed to have special properties, possibly related to ancient turquoise or similar blue-green stones.
From the same Greek root 'callais' (a blue stone), combined with the mineral suffix '-ite'. Ancient scholars used this term for exotic stones imported from distant lands, reflecting pre-modern attempts to classify unusual gemstones.
Medieval lapidaries listed 'callainite' as a healing stone, but historians now think it was probably just misidentified turquoise—showing how the same physical object could have different names depending on who was trading it.
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