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On our tour, Dr. Harlow spied more history in another goliath rock, a slab of amphibolite from Gore Mountain in upstate New York.

Mr. Horenstein pointed out areas where the gneiss and the schist had deformed around the harder strata of amphibolite, as a viscous liquid might make its way slowly around a dam.

They will find a Something there, In a cavern where no sound is, In a room of milky marble Walled with black amphibolite Over-scored with faded words And stained with time!

The term is to some extent synonymous with “amphibolite” and “hornblende-schist.”

It may be termed hornblende rock, or amphibolite.