a black variety of jasper (basanite) used by jewellers as a touchstone for testing gold.
| 单词 | θ7028 |
| 释义 | the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > quartz > basanite (3) Lydian-stone1720 a black variety of jasper (basanite) used by jewellers as a touchstone for testing gold. basanite1794 A velvet-black siliceous variety of quartz, used on account of its blackness and hardness for testing the purity of precious metals, by means of the… lydite1816 = Lydian-stone n. at Lydian, adj. 3. |
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