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chalcedony

/kælˈsɛdəni/

Meanings

noun

玉髓

A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.

Examples :

工匠小心地打磨着这块玉髓,直到它那乳白色的半透明质地能完美地捕捉光线。