A rare mineral or a medicinal preparation, related to historic eye treatments.
From 'collyrium' combined with the suffix '-ite', which is used in mineralogy. The formation suggests either a mineral compound or a solidified form of collyrium eye salve.
The '-ite' suffix in mineralogy is so popular that people started applying it to all sorts of things—including ancient medicines, creating charming but scientifically questionable names!
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