zircon

noun

a common mineral occurring in small crystals
小さな結晶体で現れる一般的な鉱物

chief source of zirconium
ジルコニウムの主要な鉱石

used as a refractory when opaque and as a gem when transparent
不透明な場合は耐火材に、透明な場合は宝石として用いられる

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