Basanite



a basaltic rock composed chiefly of plagioclase, olivine, and augite.
Historical Examples

basanite, bas′an-īt, n. a kind of quartz serviceable for testing the purity of the precious metals by the marks made.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

basanite is also known as Lydian stone or touchstone on account of its use for trying the purity of metals.
Birds and Nature Vol. 11 No. 2 [February 1902] Various

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

noun
a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone

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