Synonyms for basanite

Or is he a kind of basanite for bunches, and do they come out on us at the sight of him?

Basanite, bas′an-īt, n. a kind of quartz serviceable for testing the purity of the precious metals by the marks made.

Basanite is also known as Lydian stone or touchstone on account of its use for trying the purity of metals.