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Use "basaltic" in a sentence
"In this he found a group of green lights burning upon a kind of basaltic altar, and a bell-rope from a belfry overhead hanging down into the centre of the place."
"The chain of granite mountains continued to our right, parallel with the road, which was overspread with silex, and farther on we met with a kind of basaltic tufa, forming low hills covered with sand."
"Vertical tree trunks preserved in rock strata are evidence of continental type volcanos (as opposed to basaltic oceanic crustal volcanos)."