Opal

"Opal" in Vietnamese

miêu nhãn thạch

(a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity)

ngọc mắt mèo

(a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity)

opan

(a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity)

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