单词 nigrine 释义 ▪ I. nigrine, n. Min.|ngran|Also nigrin.[f. L. nigr- black + -ine5. Named 1800.]A black ferriferous variety of rutile.1805Jameson Min. II. 502 The red colour..distinguishes it at once from nigrine.1836T. Thomson Min., Geol., etc. I. 46...