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 -n-lcite, formerly used as a touchstone
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