| 单词 | rock flint |
| 释义 | > as lemmasrock flint rock flint n. now rare flint in massive form; chert. ΚΠ 1769 W. Sharp Treat. Coal-mines iv. 64 A very hard stone, called rock flint stone. 1811 J. Pinkerton Petralogy I. ii. ii. 154 Bluish grey rock-flint, sometimes mamellated, and approaching to chalcedony, from the lead-mines of Bretagne. 1996 Ceramic Industry (Nexis) Jan. 39 Sand flint, rock flint and tripoli flint (generally called potters flint) are various types of ground sandstone and quartzite. < as lemmas |
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