A hard yellow-green mineral made of beryllium and aluminum that is sometimes used as a gemstone.
From Greek chrysos (gold) + beryllium (named after the beryl stone). The word combines the Greek prefix for gold with the name of a mineral family, reflecting the gemstone's golden-yellow appearance.
Chrysoberyl is famous for creating the rare cat's-eye gemstone when it contains tiny needle-like inclusions that reflect light in a glowing band—the same optical effect that makes a real cat's eyes shine in the dark!
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