| 释义 |
durain
dur·ain D5442650 (do͝or′ān, dyo͝or′-)n. A gray to brownish-black band in bituminous coal, characterized by a granular fracture and a dull luster.
[Latin dūrus, hard; see deru- in Indo-European roots + (fus)ain.]durain
durain[′du̇‚rān] (geology) A hard, granular ingredient of banded coal which occurs in lenticels and shows a close, firm texture. Also known as durite. |