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The jeweler explained that the deep blue stones were actually corundum, a crystalline form of aluminum oxide prized for its hardness.
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The jeweler explained that the deep blue stones were actually corundum, a crystalline form of aluminum oxide prized for its hardness.
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Related words
corundum
IPA(Pronunciation)
Noun
countable
uncountable
Japanese Meaning
極めて硬い鉱物。酸化アルミニウム（Al₂O₃）の一種で、サファイアやルビーとして宝石に用いられる。また、研磨材としても利用される。
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