LYDIAN STONE
\lˈɪdi͡ən stˈə͡ʊn], \lˈɪdiən stˈəʊn], \l_ˈɪ_d_iə_n s_t_ˈəʊ_n]\
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A compact variety of flinty slate, of a velvet-black colour, with a flat-conchoidal fracture and keen cutting grain, long used as a touchstone for gold, whose purity is shown by the colour of the streak left on its smoothed surface.
By Stormonth, James, Phelp, P. H.
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