gāng​shí

corundum

刚石 剛石 gāng​shí
corundum
A mineral mainly composed of aluminum oxide, second only to 金刚石 jīn​gāng​shí in hardness; red transparent varieties are known as rubies, while other colors are sapphires. Used as gemstones, industrial abrasives, or bearings in precision instruments.

Frequency

Movie subtitles
0.030 per million appears in 0% of films
Written text
0.023 per million

Cross-References

Same as

Sources