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单词 θ215530
释义
society > occupation and work > materials > raw material > mineral material > [noun] > 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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更新时间:2026/6/12 8:52:54