bazanit

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التركية - الإنجليزية
basanite
A basaltic extrusive rock, similar to chert
{n} black jasper, a siliceous stone
It is employed to test the purity of gold, the amount of alloy being indicated by the color left on the stone when rubbed by the metal
Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color